| PCA | para-chloramphetamine; parietal cell antibody; passive cutaneous anaphylaxis; patient care assistant... |
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| PCL | pacing cycle length; persistent corpus luteum; plasma cell leukemia; posterior chamber lens; posteri... |
| PD | Doctor of Pharmacy; Dublin Pharmacopoeia; interpupillary distance; Paget disease; pancreatic duct; p... |
| PICA | percutaneous transluminal coronary angioplasty; Porch Index of Communicative Abilities; posterior in... |
| PP | diphosphate group; emphysema [pink puffers]; near point of accommodation [Lat. punctum proximum]; pa... |
| pulp horn | A prolongation of the pulp extending toward the cusp of a tooth. (05 Mar 2000) |
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| horn | 1. A hard, projecting, and usually pointed organ, growing upon the heads of certain animals, especially. Of the ruminants, as cattle, goats, and the like. The hollow horns of the Ox family consist externally of true horn, and are never shed. 2. The antler of a deer, which is of bone throughout, and annually shed and renewed. 3. <zoology> Any natural projection or excrescence from an animal, resembling or thought to resemble a horn in substance or form; especially., A projection from the beak of a bird, as in the hornbill. A tuft of feathers on the head of a bird, as in the horned owl. A hornlike projection from the head or thorax of an insect, or the head of a reptile, or fish. A sharp spine in front of the fins of a fish, as in the horned pout. 4. <botany> An incurved, tapering and pointed appendage found in the flowers of the milkweed (Asclepias). 5. Something made of a horn, or in resemblance of a horn; as: A wind instrument of music; originally, one made of a horn (of an ox or a ram); now applied to various elaborately wrought instruments of brass or other metal, resembling a horn in shape. "Wind his horn under the castle wall." . See French horn. A drinking cup, or beaker, as having been originally made of the horns of cattle. "Horns of mead and ale." . The cornucopia, or horn of plenty. See Cornucopia. "Fruits and flowers from Amalthaea's horn." . A vessel made of a horn; especially, one designed for containing powder; anciently, a small vessel for carrying liquids. "Samuel took the hornof oil and anointed him [David]" . The pointed beak of an anvil. The high pommel of a saddle; also, either of the projections on a lady's saddle for supporting the leg. A curved projection on the fore part of a plane. One of the projections at the four corners of the Jewish altar of burnt offering. "Joab . . . Caught hold on the horns of the altar." . 6. One of the curved ends of a crescent; especially, an extremity or cusp of the moon when crescent-shaped. "The moon Wears a wan circle round her blunted horns." (Thomson) 7. The curving extremity of the wing of an army or of a squadron drawn up in a crescentlike form. "Sharpening in mooned horns Their phalanx." (Milton) 8. The tough, fibrous material of which true horns are composed, being, in the Ox family, chiefly albuminous, with some phosphate of lime; also, any similar substance, as that which forms the hoof crust of horses, sheep, and cattle; as, a spoon of horn. 9. A symbol of strength, power, glory, exaltation, or pride. "The Lord is . . . The horn of my salvation." (Ps. Xviii. 2) 10. An emblem of a cuckold; used chiefly in the plural. "Thicker than a cuckold's horn." Horn block, the frame or pedestal in which a railway car axle box slides up and down; also called horn plate. Horn of a dilemma. See Dilemma. Horn distemper, a disease of cattle, affecting the internal substance of the horn. Horn drum, a wheel with long curved scoops, for raising water. <chemistry> Horn lead Same as Horn quicksilver (below). <botany> Horn poppy, to exalt one's self; to act arrogantly. "'Gainst them that raised thee dost thou lift thy horn?" . To take a horn, to take a drink of intoxicating liquor. Origin: AS. Horn; akin to D. Horen, hoorn, G, Icel, Sw, & Dan. Horn, Goth. Haorn, W, Gael, & Ir. Corn, L. Cornu, Gr, and perh. Also to E. Cheer, cranium, cerebral; cf. Skr. Ciras head. Cf. Carat, Corn on the foot, Cornea, Corner, Cornet, Cornucopia, Hart. Source: Websters Dictionary (01 Mar 1998) |
| horn fly | A major pest of cattle in the Northern Hemisphere that transmits the filarial parasite Stephanofilaria stilesi. Synonym: Haematobia irritans. (05 Mar 2000) |
| shoeing-horn | 1. A curved piece of polished horn, wood, or metal used to facilitate the entrance of the foot into a shoe. 2. Figuratively: Anything by which a transaction is facilitated; a medium; by way of contempt. Anything which draws on or allures; an inducement. Source: Websters Dictionary (01 Mar 1998) |
| nail horn | An obsolete term for overgrown nail. (05 Mar 2000) |
| superior horn of falciform margin of saphenous opening | The upper part of the falciform margin of the opening in the fascia lata through which the greater saphenous vein passes. Synonym: cornu superius marginalis falciformis, Burns' falciform process, Burns' ligament, Hey's ligament. (05 Mar 2000) |
| superior horn of thyroid cartilage | One of the pair of upward prolongations from the thyroid cartilage to which the lateral hyothyroid ligament attaches. Synonym: cornu superius cartilaginis thyroideae. (05 Mar 2000) |
| iliac horn | Bony spur of posterior part of ilium, often found in nail-patella syndrome. (05 Mar 2000) |
| inferior horn | A lower or downward prolongation of a part or structure of the body. Synonym: cornu inferius. (05 Mar 2000) |
| inferior horn of falciform margin of saphenous opening | The lower part of the falciform margin of the opening in the fascia lata through which the greater saphenous vein passes. Synonym: cornu inferius marginalis falciformis hiatus sapheni. (05 Mar 2000) |
| inferior horn of lateral ventricle | The part of the lateral ventricle extending downward and forward into the medial part of the temporal lobe. See: lateral ventricle. Synonym: cornu inferius ventriculi lateralis, temporal horn. (05 Mar 2000) |
| inferior horn of thyroid cartilage | One of the pair of downward prolongations at the back of the thyroid cartilage; it articulates on each side with the cricoid cartilage. Synonym: cornu inferius cartilaginis thyroideae. (05 Mar 2000) |
| occipital horn | The posterior or occipital division of the lateral ventricle of the brain, extending backward into the occipital lobe; the posterior gray column of the spinal cord as appearing in cross section. Synonym: cornu posterius ventriculi lateralis, cornu posterius, cornua of spinal cord, occipital horn. (05 Mar 2000) |
| occipital horn syndrome | <syndrome> An X-linked recessive disorder in which there is defective biliary excretion of copper resulting in a deficiency of lysyl oxidase causing skin and joint laxity. Ocular-mucous membrane syndrome, Stevens-Johnson syndrome with associated ocular lesions (conjunctivitis, panophthalmitis, iritis), oral lesions (bullae, erosions, superficial ulcers), and genital lesions (urethritis, balanitis circinata, blebs). (05 Mar 2000) |
| temporal horn | The part of the lateral ventricle extending downward and forward into the medial part of the temporal lobe. See: lateral ventricle. Synonym: cornu inferius ventriculi lateralis, temporal horn. (05 Mar 2000) |