| pitch angle scattering | <physics> Scattering (collisional, or due to wave-particle effects) of particles in velocity space, in which the pitch angle (see entry above) is changed. (09 Oct 1997) |
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| pitch discrimination | The ability to differentiate tones. (12 Dec 1998) |
| pitch perception | A dimension of auditory sensation varying with cycles per second of the sound stimulus. (12 Dec 1998) |
| pitch poisoning | A highly fatal disease of swine, usually caused by the ingestion of fragments of the clay pigeons used as targets by shooting clubs; some cases have been caused by consumption of other bituminous substances, such as road tar and tar paper. Synonym: clay pigeon poisoning. (05 Mar 2000) |
| pitch wart | A precancerous keratotic epidermal tumour, common among workers in pitch and coal tar derivatives. See: pitch-worker's cancer. (05 Mar 2000) |
| pitch-ore | <chemical> Pitchblende. Source: Websters Dictionary (01 Mar 1998) |
| pitch-worker's cancer | Carcinoma of the skin of the face or neck, arms and hands, or the scrotum, resulting from exposure to carcinogens in pitch, which occurs naturally as asphalt, or as a residue in the distillation of tar. (05 Mar 2000) |
| pitchblende | <chemical> A pitch-black mineral consisting chiefly of the oxide of uranium; uraninite. See Uraninite. Origin: 1st pitch + blende. Source: Websters Dictionary (01 Mar 1998) |
| pitcher | 1. A wide-mouthed, deep vessel for holding liquids, with a spout or protruding lip and a handle; a water jug or jar with a large ear or handle. 2. <botany> A tubular or cuplike appendage or expansion of the leaves of certain plants. American pitcher plants, the species of Sarracenia. See Sarracenia. Australian pitcher plant, the Cephalotus follicularis, a low saxifragaceous herb having two kinds of radical leaves, some oblanceolate and entire, others transformed into little ovoid pitchers, longitudinally triple-winged and ciliated, the mouth covered with a lid shaped like a cockleshell. California pitcher plant, the Darlingtonia California. See Darlingtonia. Pitcher plant, any plant with the whole or a part of the leaves transformed into pitchers or cuplike organs, especially the species of Nepenthes. See Nepenthes. Origin: OE. Picher, OF. Pichier, OHG. Pehhar, pehhari; prob. Of the same origin as E. Beaker. Cf. Beaker. Source: Websters Dictionary (01 Mar 1998) |
| pitching | 1. The act of throwing or casting; a cast; a pitch; as, wild pitching in baseball. 2. The rough paving of a street to a grade with blocks of stone. 3. <physics> A facing of stone laid upon a bank to prevent wear by tides or currents. Pitching piece, the horizontal timber supporting the floor of a platform of a stairway, and against which the stringpieces of the sloping parts are supported. Source: Websters Dictionary (01 Mar 1998) |
| pitchstone | <geology> An igneous rock of semiglassy nature, having a luster like pitch. Source: Websters Dictionary (01 Mar 1998) |
| pith | The soft central portion of a plant stem inside the vascular cylinder. To destroy the brain of an animal (such as a frog or turtle) to render it unconscious prior to vivisection. (09 Oct 1997) |
| pitheci | <zoology> A division of mammals including the apes and monkeys. Sometimes used in the sense of Primates. Origin: NL, fr. Gr. An ape. Source: Websters Dictionary (01 Mar 1998) |
| pithecoid | <zoology> 1. Of or pertaining to the genus Pithecia, or subfamily Pithecinae, which includes the saki, ouakari, and other allied South American monkeys. 2. Of or pertaining to the anthropoid apes in particular, or to the higher apes of the Old World, collectively. Origin: Gr. An ape. Source: Websters Dictionary (01 Mar 1998) |
| pithecoid theory | The theory of human's descent with the ape from a common ancestor. See: darwinian theory. (05 Mar 2000) |
| suprameatal pit | A small depression on the mastoid part of the temporal bone, posterior to the suprameatal spine. Synonym: foveola suprameatica, mastoid fossa, fossa mastoidea, supramastoid fossa. (05 Mar 2000) |
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| inferior articular pit of atlas | One of two concave surfaces on the lateral masses of the atlas that articulate with corresponding surfaces on the axis. Synonym: facies articularis inferior atlantis, fovea articularis inferior atlantis, inferior articular pit of atlas. (05 Mar 2000) |
| inferior costal pit | Demifacet on the lower edge of the body of a vertebra articulating with the head of a rib. Synonym: fovea costalis inferior, inferior costal pit. (05 Mar 2000) |
| oblong pit of arytenoid cartilage | A broad shallow depression on the anterolateral surface of the arytenoid cartilage, for attachment of the thyroarytenoid muscle. Synonym: fovea oblonga cartilaginis arytenoideae, oblong pit of arytenoid cartilage. (05 Mar 2000) |
| optic pit | A congenital structural defect of the optic nerve head. (05 Mar 2000) |
| ear pit | Tiny pit in front of the ear: preauricular pit. A minor anomaly of no great consequence in itself. More common in blacks than whites and in females than males. Can recur in families. The presence of 2 or more minor anomalies in a child increases the probability that the child has a major malformation. (12 Dec 1998) |
| triangular pit of arytenoid cartilage | A deep depression in the upper portion of the anterolateral surface of the arytenoid cartilage, lodging glands. Synonym: fovea triangularis cartilaginis arytenoideae, triangular pit of arytenoid cartilage. (05 Mar 2000) |
| trochlear pit | A shallow depression in the roof of the orbit close to the medial margin to which is attached the pulley for the superior oblique tendon. Synonym: fovea trochlearis, fossa trochlearis, trochlear fossa, trochlear pit. (05 Mar 2000) |