SEMICIRCLE

semicircle. semicircle, halfe a circle, or compasse

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semicircle. Semicircle, n. the half of a circle, an instrument

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Sem″i‐cir′cle (?), n. 1. 1. (a) The half of a circle; the part of a circle bounded by its diameter and half of its circumference. (b) A semicircumference.
2. 2. A body in the form of half of a circle, or half of a circumference.
3. 3. An instrument for measuring angles.