Simple Definition of semicircle
: half of a circle
: an arrangement of people or things that forms a semicircle
Full Definition of semicircle
1 : a half of a circle
2 : an object or arrangement of objects in the form of a half circle
Examples of semicircle
The children sat in a semicircle.
The houses are built in a semicircle.
Origin of semicircle
Latin semicirculus, from semi- + circulus circle
First Known Use: 1526
Seen and Heard
What made you want to look up semicircle? Please tell us where you read or heard it (including the quote, if possible).