| paralbumin | <physiology> A proteidlike body found in the fluid from ovarian cysts and elsewhere. It is generally associated with a substance related to, if not identical with, glycogen. Origin: Pref. Para- + albumin. Source: Websters Dictionary (01 Mar 1998) |
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| paraldehyde | <chemistry> A polymeric modification of aldehyde obtained as a white crystalline substance. Origin: Pref. Para- + aldehyde. Source: Websters Dictionary (01 Mar 1998) |
| paralectotype | <zoology> Any one of the original syntypes remaining after the selection of a lectotype. (09 Jan 1998) |
| paraleprosis | Presence of certain trophic or nerve changes suggesting an attenuated form of leprosy in regions where the disease has long prevailed. (05 Mar 2000) |
| paralepsy | 1. A temporary attack of mental inertia and hopelessness. 2. A sudden alteration in mood or emotional tension. Origin: G. Para-+ lepsis, seizure (05 Mar 2000) |
| paralexia | Misapprehension of written or printed words, other meaningless words being substituted for them in reading. Origin: para-+ G. Lexis, speech (05 Mar 2000) |
| paralgesia | Painful paresthesia; any disorder or abnormality of the sense of pain. Origin: para-+ G. Algesis, the sense of pain (05 Mar 2000) |
| paralgia | Abnormal or unusual pain. Origin: para-+ G. Algos, pain (05 Mar 2000) |
| paralipophobia | <psychology> Morbid fear of neglect or omission of some duty. Origin: G. Paraleipo, to omit, pass over, + phobos, fear (05 Mar 2000) |
| parallactic | Relating to a parallax. (05 Mar 2000) |
| parallax | 1. The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view. 2. <astronomy> The apparent difference in position of a body (as the sun, or a star) as seen from some point on the earth's surface, and as seen from some other conventional point, as the earth's center or the sun. Annual parallax, the greatest value of the heliocentric parallax, or the greatest annual apparent change of place of a body as seen from the earth and sun; as, the annual parallax of a fixed star. Binocular parallax, the apparent difference in position of an object as seen separately by one eye, and then by the other, the head remaining unmoved. Diurnal, or Geocentric, parallax, the parallax of a body with reference to the earth's center. This is the kind of parallax that is generally understood when the term is used without qualification. Heliocentric parallax, the parallax of a body with reference to the sun, or the angle subtended at the body by lines drawn from it to the earth and sun; as, the heliocentric parallax of a planet. Horizontal parallax, the geocentric parallx of a heavenly body when in the horizon, or the angle subtended at the body by the earth's radius. Optical parallax, the apparent displacement in position undergone by an object when viewed by either eye singly. Parallax of the cross wires (of an optical instrument), their apparent displacement when the eye changes its position, caused by their not being exactly in the focus of the object glass. Stellar parallax, the annual parallax of a fixed star. Origin: Gr. Alternation, the mutual inclination of two lines forming an angle, fr. To change a little, go aside, deviate; beside, beyond + to change: cf. F. Parallaxe. Cf. Parallel. Source: Websters Dictionary (01 Mar 1998) |
| parallax method | Localization of a foreign body by observing the direction of its motion on a fluoroscopic screen while moving the X-ray tube or the screen. (05 Mar 2000) |
| parallax test | Measurement of the deviation in strabismus by the alternate cover test combined with neutralization of the deviation using prisms. (05 Mar 2000) |
| parallel | 1. Pertaining to straight lines or planes that do not intersect. 2. <physics> Pertaining to electric circuit components connected in parallel so that the current flow divides, each branch passing through one component and rejoins, applied by extension to any similar parallel circuit, for example the systemic circulation to the various organs. (18 Nov 1997) |
| parallel attachment | A frictional or mechanically retained unit used in fixed or removable prosthodontics, consisting of closely fitting male and female parts, an attachment that may be rigid in function or may incorporate a movable stress control unit to reduce the torque on the abutment. Synonym: frictional attachment, internal attachment, key attachment, keyway attachment, parallel attachment, slotted attachment. (05 Mar 2000) |