Sem"i*cir`cle (?), n. 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. A body in the form of half of a circle, or half of a circumference.

3. An instrument for measuring angles.

Sem"i*cir`cle (?), n. 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. A body in the form of half of a circle, or half of a circumference.

3. An instrument for measuring angles.

• half of a circle