Etymology
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semicircle (n.)

also semi-circle, "the half of a circle," 1520s, from semi- + circle (n.) or else from Latin semicirculus. Also compare semicircular. The meaning "a body or arrangement of objects in a half circle" is by 1590s.

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Definitions of semicircle

semicircle (n.)
a plane figure with the shape of half a circle;
Synonyms: hemicycle
From wordnet.princeton.edu