arc-quadrant

arc-quadrant
arc-quad·rant (ahrk-kwodґrənt) an arc guidance system that has a 90° arc.

Medical dictionary. 2011.

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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

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