semicircle

noun

Meaning

A half of a circle.
A surveyor's instrument for measuring angles; a graphometer.
An arc whose center is the penalty spot, extending from the top of the penalty area.
To travel or move around in a semicircle.

Etymology / origin

Etymology tree Proto-Indo-European *sem- Proto-Indo-European *sēmi Latin sēmi-bor. English semi- Ancient Greek κίρκος (kírkos)bor. Latin circus Proto-Indo-European *-lós Proto-Indo-European *-elós Proto-Italic *-elos Latin -ulus Latin circulus Old French cerclebor. Middle English circle English circle English semicircle From semi- + circle.

Sources

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