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trap	<geology> An old term rather loosely used to designate various dark-coloured, heavy igneous rocks, including especially the feldspathic-augitic rocks, basalt, dolerite, amygdaloid, etc, but including also some kinds of diorite. Called also trap rock. Trap tufa, Trap tuff, a kind of fragmental rock made up of fragments and earthy materials from trap rocks. Origin: Sw. Trapp; akin to trappa stairs, Dan. Trappe, G. Treppe, D. Trap; so called because the rocks of this class often occur in large, tabular masses, rising above one another, like steps. See Tramp. 1. A machine or contrivance that shuts suddenly, as with a spring, used for taking game or other animals; as, a trap for foxes. "She would weep if that she saw a mouse Caught in a trap." (Chaucer) 2. A snare; an ambush; a stratagem; any device by which one may be caught unawares. "Let their table be made a snare and a trap." (Rom. Xi. 9) "God and your majesty Protect mine innocence, or I fall into The trap is laid for me!" (Shak) 3. A wooden instrument shaped somewhat like a shoe, used in the game of trapball. It consists of a pivoted arm on one end of which is placed the ball to be thrown into the air by striking the other end. Also, a machine for throwing into the air glass balls, clay pigeons, etc, to be shot at. 4. The game of trapball. 5. A bend, sag, or partitioned chamber, in a drain, soil pipe, sewer, etc, arranged so that the liquid contents form a seal which prevents passage of air or gas, but permits the flow of liquids. 6. A place in a water pipe, pump, etc, where air accumulates for want of an outlet. 7. A wagon, or other vehicle. 8. A kind of movable stepladder. Trap stairs, a staircase leading to a trapdoor. <botany> Trap tree the jack; so called because it furnishes a kind of birdlime. See 1st Jack. Origin: OE. Trappe, AS. Treppe; akin to OD.trappe, OHG. Trapo; probably fr. The root of E. Tramp, as that which is trod upon: cf. F. Trappe, which is trod upon: cf. F. Trappe, which perhaps influenced the English word. Source: Websters Dictionary (01 Mar 1998)
trapdoor	1. A lifting or sliding door covering an opening in a roof or floor. 2. <chemical> A door in a level for regulating the ventilating current; called also weather door. <zoology> Trapdoor spider, any one of several species of large spiders which make a nest consisting of a vertical hole in the earth, lined with a hinged lid, like a trapdoor. most of the species belong to the genus Cteniza, as the California species (C. Californica). Source: Websters Dictionary (01 Mar 1998)
trapes	A slattern; an idle, sluttish, or untidy woman. See: Trape. Source: Websters Dictionary (01 Mar 1998)
trapeze	1. <geometry> A trapezium. See Trapezium. 2. A swinging horizontal bar, suspended at each end by a rope; used by gymnasts. Origin: Cf. F. Trapeze. Source: Websters Dictionary (01 Mar 1998)
trapezial	Relating to any trapezium. (05 Mar 2000)
trapeziform	1. <geometry> A plane four-sided figure, having two sides parallel to each other. 2. <anatomy> A bone of the carpus at the base of the second metacarpal, or index finger. Origin: Gr. Trapezoid-shaped; table + shape, likeness: cf. F. Trapezoide. See Trapezium. 1. Having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle. 2. <anatomy> Of or pertaining to the trapezoid ligament; as, the trapezoid line. Source: Websters Dictionary (01 Mar 1998)
trapeziometacarpal	Relating to the trapezium and the metacarpus. (05 Mar 2000)
trapezium	Origin: NL, fr. Gr. A little table, an irregular four-sided figure, dim. Of a table, for; (see Tetra-) + foot, akin to foot; hence, originally, a table with four feet. See Foot. 1. <geometry> A plane figure bounded by four right lines, of which no two are parallel. 2. <anatomy> A bone of the carpus at the base of the first metacarpal, or thumb. A region on the ventral side of the brain, either just back of the pons Varolii, or, as in man, covered by the posterior extension of its transverse fibres. Source: Websters Dictionary (01 Mar 1998)
trapezium bone	Origin: NL, fr. Gr. A little table, an irregular four-sided figure, dim. Of a table, for; (see Tetra-) + foot, akin to foot; hence, originally, a table with four feet. See Foot. 1. <geometry> A plane figure bounded by four right lines, of which no two are parallel. 2. <anatomy> A bone of the carpus at the base of the first metacarpal, or thumb. A region on the ventral side of the brain, either just back of the pons Varolii, or, as in man, covered by the posterior extension of its transverse fibres. Source: Websters Dictionary (01 Mar 1998)
trapezius	<anatomy, muscle> Origin, medial third of superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of seventh cervical and the thoracic vertebrae and corresponding supraspinous ligaments; insertion, lateral third of posterior surface of clavicle, anterior side of acromion, and upper and medial border of the spine of the scapula; action, when scapulae are fixed, portions of muscle can act independently: cervical portion elevates scapula, thoracic portion contributes to depression of scapula; upper and lowermost portions act simultaneously to rotate glenoid fossa superiorly; when the entire muscle and especially middle part contracts, the scapulae retract; draws head to one side or backward; nerve supply, motor by accessory, sensory by cervical plexus. Synonym: musculus trapezius, cowl muscle, trapezius. (05 Mar 2000)
trapezohedron	<chemistry> A solid bounded by twenty-four equal and similar trapeziums; a tetragonal trisoctahedron. See the Note under Trisoctahedron. A tetartohedral solid of the hexagonal system, bounded by six trapezoidal planes. The faces of this form are common on quartz crystals. Origin: NL, from trapezium + Gr. Seat, base, fr. To sit. Source: Websters Dictionary (01 Mar 1998)
trapezoid	1. <geometry> A plane four-sided figure, having two sides parallel to each other. 2. <anatomy> A bone of the carpus at the base of the second metacarpal, or index finger. Origin: Gr. Trapezoid-shaped; table + shape, likeness: cf. F. Trapezoide. See Trapezium. 1. Having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle. 2. <anatomy> Of or pertaining to the trapezoid ligament; as, the trapezoid line. Source: Websters Dictionary (01 Mar 1998)
trapezoid body	A plate of transverse fibres running over the dorsal (deep) border of the pontine nuclei; it is formed by ascending auditory fibres that cross to the opposite side of the brainstem. Synonym: corpus trapezoideum, trapezoid. (05 Mar 2000)
trapezoid bone	A bone in the distal row of the carpus; it articulates with the second metacarpal, trapezium, capitate, and scaphoid. Synonym: os trapezoideum, lesser multangular bone, os multangulum minus, trapezoid. (05 Mar 2000)
trapezoid ligament	<anatomy> The lateral part of the coracoclavicular ligament that attaches to the trapezoid line of the clavicle. Synonym: ligamentum trapezoideum. (05 Mar 2000)