| ping-pong | See: ping-pong mechanism. Origin: Ping-Pong, trademark for table tennis (05 Mar 2000) |
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| ping-pong bone | The thin shell of osseous tissue at the periphery of a giant cell tumour in a bone. (05 Mar 2000) |
| ping-pong mechanism | A special multisubstrate reaction in which, for a two-substrate, two-product (i.e., bi-bi) system, an enzyme reacts with one substrate to form a product and a modified enzyme, the latter then reacting with a second substrate to form a second, final product, and regenerating the original enzyme. An example of such a mechanism is found in the aminotransferases. More complex ping-pong mechanisms exist for enzymes having more than two substrates. Synonym: double displacement mechanism. (05 Mar 2000) |
| pinguecula | A yellow spot on the white of the eye, usually toward the inside (nose side) of the eye, associated with aging. It looks fatty (in latin the word pinguiculus means fattish), and is due to an accumulation of connective tissue. (12 Dec 1998) |
| pinguicula | <botany> See Butterwort. Origin: NL, fr. L. Pinguiculus somewhat fat, fattish. Source: Websters Dictionary (01 Mar 1998) |
| pinic | <chemistry> Of or pertaining to the pine; obtained from the pine; formerly, designating an acid which is the chief constituent of common resin, now called abietic, or sylvic, acid. Origin: L. Pinus pine. Source: Websters Dictionary (01 Mar 1998) |
| piniform | Synonym: pineal. Origin: L. Pinus, pine, + forma, form (05 Mar 2000) |
| pinion | <zoology> A moth of the genus Lithophane, as L. Antennata, whose larva bores large holes in young peaches and apples. 1. A feather; a quill. 2. A wing, literal or figurative. "Swift on his sooty pinions flits the gnome." (Pope) 3. The joint of bird's wing most remote from the body. 4. A fetter for the arm. 5. <mechanics> A cogwheel with a small number of teeth, or leaves, adapted to engage with a larger wheel, or rack (see Rack); especially, such a wheel having its leaves formed of the substance of the arbor or spindle which is its axis. Lantern pinion. See Lantern. Pinion wire, wire fluted longitudinally, for making the pinions of clocks and watches. It is formed by being drawn through holes of the shape required for the leaves or teeth of the pinions. Origin: OF. Pignon a pen, F, gable, pinion (in sense 5); cf. Sp. Pinon pinion; fr. L. Pinna pinnacle, feather, wing. See Pin a peg, and cf. Pen a feather, Pennat, Pennon. Source: Websters Dictionary (01 Mar 1998) |
| pinionist | <zoology> Any winged creature. Source: Websters Dictionary (01 Mar 1998) |
| pinite | <chemical> A compact granular cryptocrystalline mineral of a dull grayish or greenish white colour. It is a hydrous alkaline silicate, and is derived from the alteration of other minerals, as iolite. Origin: So called from Pini, a mine in Saxony. 1. (Paleon) Any fossil wood which exhibits traces of having belonged to the Pine family. 2. <chemistry> A sweet white crystalline substance extracted from the gum of a species of pine (Pinus Lambertina). It is isomeric with, and resembles, quercite. Origin: L. Pinus the pine tree. Source: Websters Dictionary (01 Mar 1998) |
| pink | 1. <botany> A name given to several plants of the caryophyllaceous genus Dianthus, and to their flowers, which are sometimes very fragrant and often double in cultivated varieties. The species are mostly perennial herbs, with opposite linear leaves, and handsome five-petaled flowers with a tubular calyx. 2. A colour resulting from the combination of a pure vivid red with more or less white; so called from the common colour of the flower. 3. Anything supremely excellent; the embodiment or perfection of something. "The very pink of courtesy." 4. <zoology> The European minnow; so called from the colour of its abdomen in summer. Bunch pink is Dianthus barbatus. China, or Indian, pink. See China. Clove pink is Dianthus Caryophyllus, the stock from which carnations are derived. Garden pink. See Pheasant's eye. Meadow pink is applied to Dianthus deltoides; also, to the ragged robin. Maiden pink, Dianthus deltoides. Moss pink. See Moss. Pink needle, the pin grass; so called from the long, tapering points of the carpels. See Alfilaria. Sea pink. See Thrift. Origin: Perh. Akin to pick; as if the edges of the petals were picked out. Cf. Pink. Resembling the garden pink in colour; of the colour called pink (see 6th Pink, 2); as, a pink dress; pink ribbons. <medicine> Pink eye, the double chlorides of (stannic) tin and ammonium, formerly much used as a mordant for madder and cochineal. Pink saucer, a small saucer, the inner surface of which is covered with a pink pigment. Source: Websters Dictionary (01 Mar 1998) |
| pink bread mold | A fungus of the group Ascomycetes. It is haploid and grows as a mycelium. There are two mating types and fusion of nuclei of two opposite types leads to meiosis followed by mitosis. The resulting eight nuclei generate eight ascospores. These are arranged linearly in an ordered fashion in a pod like ascus, so that the various products of meiotic division can be identified and isolated. Because of this, Neurospora crassa is one of the classic organisms for genetic research, studies on biochemical mutants led Beadle and Tatum to propose the seminal one gene one enzyme hypothesis. (18 Nov 1997) |
| pink disease | Pain in the extremities. (12 Dec 1998) |
| pinkeye | Synonym: acute contagious conjunctivitis. Synonym: infectious bovine keratoconjunctivitis. 3. In horses, a form of equine viral arteritis. (05 Mar 2000) |
| pinkroot | 1. <medicine> The root of Spigelia Marilandica, used as a powerful vermifuge; also, that of S. Anthelmia. See definition 2 (below). 2. <botany> A perennial North American herb (Spigelia Marilandica), sometimes cultivated for its showy red blossoms. Called also Carolina pink, Maryland pinkroot, and worm grass. An annual South American and West Indian plant (Spigelia Anthelmia). Source: Websters Dictionary (01 Mar 1998) |
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| pinguicula |
butterworts: a large genus of almost stemless carnivorous bog plants; Europe and America to Antarctica
Ãâó: wordnet.princeton.edu/perl/webwn
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| pinky |
little finger: the finger farthest from the thumb
Ãâó: wordnet.princeton.edu/perl/webwn
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| pindolol |
an oral beta blocker (trade name Visken) used in treating hypertension
Ãâó: wordnet.princeton.edu/perl/webwn
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| pineal body |
1. glandula pinealis. 2. the posterior eyelike structure arising from the median of the dorsal wall of the thalamus in some lower vertebrates. See also epiphyseal eye, under eye.
Ãâó: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| ping-pong fracture |
pond fracture, a type of depressed skull fracture usually seen in young children, resembling the indentation that can be produced with the finger in a ping-pong ball; when elevated it resumes and retains its normal position.
Ãâó: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| pin | small sharp biting |
|---|---|
| pin | a sudden unforeseen crisis (usually involving danger) that requires immediate action |
| pin | a slight but appreciable addition |
| pin | an injury resulting from getting some body part squeezed |
| pin | a painful or straitened circumstance |
| pin | irritate as if by a nip, pinch, or tear |
| pin | cut the top off |
| pin | squeeze tightly between the fingers |
| pin | make ridges into by pinching together |
| pin | make off with belongings of others |
| pin | a lever with a pointed projection that serves as a fulcrum |
| pin | (baseball or softball) a substitute for the regular batter |
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