Definitions

1. noun

A half of a circle.

“The semicircle of the moon glowed in the night sky.”

2. noun

A half of a circle, especially one cut off by a diameter or chord.

“The semicircle of the Ferris wheel rotated slowly.”

3. noun

A half of a circle, especially one in a figure or design.

“The semicircle of the ancient temple was an impressive sight.”