a. and sb. Geom. Also 6 (as sb.; ? mod.L.) lunulare. [f. LUNULA + -AR.]

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  A.  adj. Pertaining to a lune or lunule; in the form of a lunule, crescent-shaped.

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1727–51.  Chambers, Cycl., s.v. Angle, Lunular Angle … is that formed by the intersection of two curve lines; the one concave, and the other convex.

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1740.  Anderson, in Rigaud, Corr. Sci. Men (1841), I. 363. There is no need of the proportion of the arches … in order to measure the lunular segment.

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1788.  T. Taylor, Proclus, I. 168. Two circumferences, either making angles, as in the lunular figure, or [etc.].

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1797.  Encycl. Brit. (ed. 3), III. 442/2. (Botany) The figure of Similitudes is … Lunular, crescent-shaped, subrotund.

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  † B.  sb. A crescent-shaped figure. Obs.

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1570.  Dee, Math. Pref., a iij b. A perfect Square,… Lunular, Ryng, Serpentine [etc.].

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1579.  Digges, Stratiot., 104. Causing them … to change from Triangle to Square, from Circulare to Lunulare.

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1674.  Jeake, Arith. (1696), 12. The Lunular Decrescent is the sign of the Quotient of any Division.

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1789.  T. Taylor, Proclus, II. 44. In lunulars and systroides.

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