- arc-quadrant
- arc-quad·rant (ahrk-kwodґrənt) an arc guidance system that has a 90° arc.
Medical dictionary. 2011.
arc-quadrant
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arc guidance system — an apparatus used in stereotactic surgery consisting of a metal arc shaped band or bar with degree markings and an attachment for an electrode that is positioned by moving through the arc to aim at a precise location in the brain. Cf. arc… … Medical dictionary
quadrant — [ kadrɑ̃ ] n. m. • 1868; « quart du jour » XVe; lat. quadrans, quadrantis « quart »; cf. cadran ♦ Math. Quart de la circonférence du cercle. ♢ Chacune des quatre portions du plan délimitées par un système de coordonnées rectangulaires. ⊗ HOM.… … Encyclopédie Universelle
Quadrant — Quad rant, n. [L. quadrans, antis, a fourth part, a fourth of a whole, fr. quattuor four: cf. F. quadrant, cadran. See {Four}, and cf. {Cadrans}.] 1. The fourth part; the quarter. [Obs.] Sir T. Browne. [1913 Webster] 2. (Geom.) The quarter of a… … The Collaborative International Dictionary of English
Quadrant of altitude — Quadrant Quad rant, n. [L. quadrans, antis, a fourth part, a fourth of a whole, fr. quattuor four: cf. F. quadrant, cadran. See {Four}, and cf. {Cadrans}.] 1. The fourth part; the quarter. [Obs.] Sir T. Browne. [1913 Webster] 2. (Geom.) The… … The Collaborative International Dictionary of English
Arc — Arc, n. [F. arc, L. arcus bow, arc. See {Arch}, n.] 1. (Geom.) A portion of a curved line; as, the arc of a circle or of an ellipse. [1913 Webster] 2. A curvature in the shape of a circular arc or an arch; as, the colored arc (the rainbow); the… … The Collaborative International Dictionary of English
quadrant — [kwä′drənt] n. [ME < L quadrans, fourth part < quadrare: see QUADRATE] 1. a fourth part of the circumference of a circle; an arc of 90° 2. a quarter section of a circle 3. any piece or part shaped like a quarter section of a circle 4. an… … English World dictionary
Quadrant (instrument) — Ptolemy using a quadrant A quadrant is an instrument that is used to measure angles up to 90°. It was originally proposed by Ptolemy as a better kind of astrolabe.[1] Several different variations of the instrument were later produced by medieval… … Wikipedia
Quadrant (instrument) — Pour les articles homonymes, voir Quadrant. Le quadrant mobile d Augustin Stark (1815). Le quadrant est un ancien instrument de navigation qui servait à faire le point sur sa position en … Wikipédia en Français
Quadrant (architecture) — [ corps de logis of Kedleston Hall] Quadrant in architecture refers to a curve in a wall or a vaulted ceiling. Generally considered to be an arc of 90 degrees one quarter of a circle, or a half of the more commonly seen architectural feature a… … Wikipedia
quadrant — quadrantal /kwo dran tl/, adj. quadrantlike, adj. /kwod reuhnt/, n. 1. a quarter of a circle; an arc of 90°. 2. the area included between such an arc and two radii drawn one to each extremity. 3. something shaped like a quarter of a circle, as a… … Universalium
