| quadrifoliate | <botany> Four-leaved; having the leaves in whorls of four. Origin: Quadri- + L. Folium leaf. Source: Websters Dictionary (01 Mar 1998) |
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| 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) |
| quadrilateral space | Musculotendinous formation providing passageway for the axillary nerve, posterior humeral circumflex artery and accompanying veins as they run from the axilla to the superior posterior arm; as the neurovascular structures enter the formation anteriorly, it is bounded superiorly by the shoulder joint, medially by the lateral border of subscapularis, laterally by the surgical neck of the humerus, and inferiorly by the tendon of latissimus dorsi; as the vessels exit the formation posteriorly, it is bounded superiorly by the teres minor, medially by the long head of the triceps, laterally by the lateral head of the triceps and inferiorly by the teres major muscle or tendon; as they emerge, most of the neurovascular structures run on the deep surface of the deltoid muscle, which they supply. Synonym: quadrilateral space. (05 Mar 2000) |
| quadrilobed | Having four lobes; as, a quadrilobate leaf. Origin: Quadri- + lobe: cf. F. Quadrilobe. Source: Websters Dictionary (01 Mar 1998) |