| quadridigitate | Synonym: tetradactyl. Origin: quadri-+ L. Digitus, digit (05 Mar 2000) |
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| quadrifid | Divided, or deeply cleft, into four parts; as, a quadrifid perianth; a quadrifid leaf. Origin: L. Quadrifidus; quattuor four + findere to cleave: cf. F. Quadrifide. Source: Websters Dictionary (01 Mar 1998) |
| quadrifoliate | <botany> Four-leaved; having the leaves in whorls of four. Origin: Quadri- + L. Folium leaf. Source: Websters Dictionary (01 Mar 1998) |
| quadrigeminal | Four-fold. Origin: quadri-+ L. Geminus, twin (05 Mar 2000) |
| quadrigeminal bodies | See: inferior colliculus, superior colliculus. Synonym: corpora quadrigemina. (05 Mar 2000) |
| quadrigeminal lamina | The roofplate of the mesencephalon formed by the quadrigeminal bodies. Synonym: lamina tecti mesencephali, tectum mesencephali, lamina quadrigemina, quadrigeminal lamina, quadrigeminal plate. (05 Mar 2000) |
| quadrigeminal plate | The roofplate of the mesencephalon formed by the quadrigeminal bodies. Synonym: lamina tecti mesencephali, tectum mesencephali, lamina quadrigemina, quadrigeminal lamina, quadrigeminal plate. (05 Mar 2000) |
| quadrigeminal pulse | A pulse in which the beats are grouped in fours, a pause following every fourth beat. Synonym: pulsus quadrigeminus. (05 Mar 2000) |
| quadrigeminal rhythm | A cardiac arrhythmia in which the heartbeats are grouped in fours, each usually composed of one sinus beat followed by three extrasystoles, but a repetitive group of four of any composition is quadrigeminal. Synonym: quadrigeminy. (05 Mar 2000) |
| quadrigeminous | Fourfold; having four similar parts, or two pairs of similar parts. <anatomy> Quadrigeminal bodies, two pairs of lobes, or elevations, on the dorsal side of the midbrain of most mammals; the optic lobes. The anterior pair are called the nates, and the posterior the testes. Origin: Quadri- + L. Gemini twins. Source: Websters Dictionary (01 Mar 1998) |
| quadrigeminum | One of the quadrigeminal bodies. (05 Mar 2000) |
| quadrigeminus | Synonym: quadruplet. Origin: L. (05 Mar 2000) |
| quadrigeminy | A cardiac arrhythmia in which the heartbeats are grouped in fours, each usually composed of one sinus beat followed by three extrasystoles, but a repetitive group of four of any composition is quadrigeminal. Synonym: quadrigeminy. (05 Mar 2000) |
| quadrijugous | <botany> Pinnate, with four pairs of leaflets; as, a quadrijugous leaf. Origin: L. Quadrijugus of a team of four; quattuor four + jugum yoke. Source: Websters Dictionary (01 Mar 1998) |
| quadrilateral | 1. <geometry> A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines. 2. An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano. <geometry> Complete quadrilateral, the figure made up of the six straight lines that can be drawn through four points, A, B, C, I, the lines being supposed to be produced indefinitely. Source: Websters Dictionary (01 Mar 1998) |