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n. A half of a circle as divided by a diameter.

n. An object or arrangement of objects or people in the shape of half a circle.

n. Half of a circle.

n. An instrument for measuring angles.

n.

n. The half of a circle; the part of a circle bounded by its diameter and half of its circumference.

n. A semicircumference.

n. A body in the form of half of a circle, or half of a circumference.

n. An instrument for measuring angles.

n. The half of a circle; the part of a circle comprehended between a diameter and the half of a circumference; also, the half of the circumference itself.

n. Any body or arrangement of objects in the form of a half-circle.

n. An instrument for measuring angles; a species of theodolite with only half a graduated circle; a graphometer.

n. In meteorology, one half of the area covered by a cyclonic storm. In the northern hemisphere the dangerous semicircle for navigation is that on the right-hand side as one advances along the path of the center of a progressive storm: the manageable, or navigable, or safer semicircle is that on the left-hand side.

n. a plane figure with the shape of half a circle

"The mind would then only tend to the affirmation of the sole motion of a semicircle, which is not contained in the conception of a semicircle, and does not arise from the conception of any cause capable of producing such motion."

two-dimensional figure    plane figure   

barred semicircle    semicircle balk    semicircular   

semicircumference   

arc    crescent    amphitheatre    triangle    concourse