| plancher | 1. A floor of wood; also, a plank. 2. The under side of a cornice; a soffit. Origin: F, planche. See Planch. Source: Websters Dictionary (01 Mar 1998) |
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| planchet | A small, flat plate or dish used to support a sample for radioactivity determination; the sample is usually evaporated on (in) the planchet. Origin: Fr. Planchette, dim. Of planche, plank (05 Mar 2000) |
| planchette | 1. A circumferentor. See Circumferentor. 2. A small tablet of wood supported on casters and having a pencil attached. The characters produced by the pencil on paper, while the hand rests on the instrument and it is allowed to move, are sometimes translated as of oracular or supernatural import. Origin: F. See Planchet. Source: Websters Dictionary (01 Mar 1998) |
| Planck's constant | A constant, 6.6260755 × 10-34 J - s (joule-seconds) or 6.6260755 × 10-27 erg-seconds = 6.6260755 × 10-34 J Hz-1 (joule per hertz). (05 Mar 2000) |
| Planck's theory | The theory that the radiation and absorption of energy take place in definite quantities called quanta (e) which vary in size and are defined by the equation e=hv in which h is planck's constant and v is the frequency of the radiation. (12 Dec 1998) |
| Planck, Max | <person> German physicist and Nobel laureate, 1858-1947. See: Planck's constant, Planck's theory. (05 Mar 2000) |
| plane | 1. To make smooth; to level; to pare off the inequalities of the surface of, as of a board or other piece of wood, by the use of a plane; as, to plane a plank. 2. To efface or remove. "He planed away the names . . . Written on his tables." (Chaucer) 3. Figuratively, to make plain or smooth. "What student came but that you planed her path." (Tennyson) Origin: Cf. F. Planer, L. Planare, fr. Planus. See Plane, Plain, and cf. Planish. <botany> Any tree of the genus Platanus. The Oriental plane (Platanus orientalis) is a native of Asia. It rises with a straight, smooth, branching stem to a great height, with palmated leaves, and long pendulous peduncles, sustaining several heads of small close-sitting flowers. The seeds are downy, and collected into round, rough, hard balls. The Occidental plane (Platanus occidentalis), which grows to a great height, is a native of North America, where it is popularly called sycamore, buttonwood, and buttonball, names also applied to the California species (Platanus racemosa). Origin: F, fr. L. Platanus, Gr, fr. Broad; so called on account of its broad leaves and spreading form. See Place, and cf. Platane, Plantain the tree. Without elevations or depressions; even; level; flat; lying in, or constituting, a plane; as, a plane surface. In science, this word (instead of plain) is almost exclusively used to designate a flat or level surface. Plane angle, the angle included between two straight lines in a plane. Plane chart, Plane curve. See Chart and Curve. Plane figure, a figure all points of which lie in the same plane. If bounded by straight lines it is a rectilinear plane figure, if by curved lines it is a curvilinear plane figure. Plane geometry, that part of geometry which treats of the relations and properties of plane figures. Plane problem, a problem which can be solved geometrically by the aid of the right line and circle only. Plane sailing, a scale for the use of navigators, on which are graduated chords, sines, tangents, secants, rhumbs, geographical miles, etc. Plane surveying, surveying in which the curvature of the earth is disregarded; ordinary field and topographical surveying of tracts of moderate extent. Plane table, an instrument used for plotting the lines of a survey on paper in the field. Plane trigonometry, the branch of trigonometry in which its principles are applied to plane triangles. Origin: L. Planus: cf. F. Plan. See Plan. 1. <geometry> A surface, real or imaginary, in which, if any two points are taken, the straight line which joins them lies wholly in that surface; or a surface, any section of which by a like surface is a straight line; a surface without curvature. 2. <astronomy> An ideal surface, conceived as coinciding with, or containing, some designated astronomical line, circle, or other curve; as, the plane of an orbit; the plane of the ecliptic, or of the equator. 3. <mechanics> A block or plate having a perfectly flat surface, used as a standard of flatness; a surface plate. 4. A tool for smoothing boards or other surfaces of wood, for forming moldings, etc. It consists of a smooth-soled stock, usually of wood, from the under side or face of which projects slightly the steel cutting edge of a chisel, called the iron, which inclines backward, with an apperture in front for the escape of shavings; as, the jack plane; the smoothing plane; the molding plane, etc. <geometry> Objective plane, the plane in which lie both the incident ray and the refracted or reflected ray. Origin: F. Plane, L. Plana. See Plane, &. Source: Websters Dictionary (01 Mar 1998) |
| plane joint | A synovial joint in which the opposing surfaces are nearly planes and in which there is only a slight, gliding motion, as in the intermetacarpal joints. Synonym: articulatio plana, arthrodia, arthrodial articulation, arthrodial joint, gliding joint. (05 Mar 2000) |
| plane of incidence | The plane perpendicular to a lens surface that contains the incident light ray. (05 Mar 2000) |
| plane of inlet | The upper opening of the true pelvis, bounded anteriorly by the pubic symphysis and the pubic crest on either side, laterally by the iliopectineal lines, and posteriorly by the promontory of the sacrum. Synonym: apertura pelvis superior, aditus pelvis, first parallel pelvic plane, pelvic brim, pelvic inlet, pelvic plane of inlet, plane of inlet. (05 Mar 2000) |
| plane of least pelvic dimensions | The plane that extends from the end of the sacrum to the inferior border of the pubic symphysis; it is bounded posteriorly by the end of the sacrum, laterally by the ischial spines, and anteriorly by the inferior border of the pubic symphysis. Synonym: midplane, plane of least pelvic dimensions, plane of midpelvis, third parallel pelvic plane. (05 Mar 2000) |
| plane of midpelvis | The plane that extends from the end of the sacrum to the inferior border of the pubic symphysis; it is bounded posteriorly by the end of the sacrum, laterally by the ischial spines, and anteriorly by the inferior border of the pubic symphysis. Synonym: midplane, plane of least pelvic dimensions, plane of midpelvis, third parallel pelvic plane. (05 Mar 2000) |
| plane of outlet | The lower opening of the true pelvis, bounded anteriorly by the pubic arch, laterally by the rami of the ischium and the sacrotuberous ligament on either side, and posteriorly by these ligaments and the tip of the coccyx. Synonym: apertura pelvis inferior, apertura pelvis minoris, fourth parallel pelvic plane, pelvic outlet, pelvic plane of outlet, plane of outlet. (05 Mar 2000) |
| plane of pelvic canal | A hypothetical curved line joining the centre point of each of the four planes of the pelvis, marking the centre of the pelvic cavity at every level. Synonym: axis pelvis, plane of pelvic canal. (05 Mar 2000) |
| plane of regard | An imaginary plane through which the point of regard moves as the eyes are turned from side to side. (05 Mar 2000) |
Synonyms : Crown Galls, Gall, Crown, Gall, Plant, Galls, Crown, Plant Gall, Plant Tumor, Tumor, Plant, Tumors, Plant
Synonyms : Movement Protein, Plant Virus, Movement Proteins, Plant Virus, Movement Proteins, Virus, Plant, Plant Virus Movement Proteins, Virus Movement Proteins, Plant
Synonyms : Plant Virus, Virus, Plant, Viruses, Plant
Synonyms : Plantaginaceae
Synonyms : Antibodies, Plant Derived, Antibodies, Recombinant Plant, Plant-Derived Antibodies, Recombinant Plant Antibodies
| planula |
the flat ciliated free-swimming larva of hydrozoan coelenterates
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| placoid |
as the hard flattened scales of e.g. sharks
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| plagiocephaly |
congenital malformation of the skull in which the main axis of the skull is oblique
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| plague |
a serious (sometimes fatal) infection of rodents caused by Yersinia pestis and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal any epidemic disease with a high death rate infestation: a swarm of insects that attack plants; "a plague of grasshoppers" any large scale calamity (especially when thought to be sent by God) blight: cause to suffer a blight; "Too much rain may blight the garden with mold" an annoyance; "those children are a damn plague" harass: annoy continually or chronically; "He is known to harry his staff when he is overworked"; "This man harasses his female co-workers"
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| plaintiff |
a person who brings an action in a court of law
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| PLA | any large scale calamity (especially when thought to be sent by God) |
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| PLA | a swarm of insects that attack plants |
| PLA | any epidemic disease with a high death rate |
| PLA | a serious (sometimes fatal) infection transmitted by the bite of an infected rat flea (especially bubonic plague) |
| PLA | annoy continually or chronically |
| PLA | cause to suffer a blight |
| PLA | a spot on the skin characteristic of the plague |
| PLA | (often followed by `with' or used in combination) troubled by or encroached upon in large numbers |
| PLA | likely to spread and cause an epidemic disease |
| PLA | causing irritation or annoyance |
| PLA | likely to spread and cause an epidemic disease |
| PLA | in a disagreeable manner |