Sagitta

A small constellation north of Aquila; the Arrow.

The keystone of an arch.

The distance from a point in a curve to the chord; also, the versed sine of an arc; -- so called from its resemblance to an arrow resting on the bow and string.

The larger of the two otoliths, or ear bones, found in most fishes.

A genus of transparent, free-swimming marine worms having lateral and caudal fins, and capable of swimming rapidly. It is the type of the class Chaetognatha.

any arrowworm of the genus Sagitta