(1):
(n.) The larger of the two otoliths, or ear bones, found in most fishes.
(2):
(n.) 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.
(3):
(n.) The keystone of an arch.
(4):
(n.) 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.
(5):
(n.) A small constellation north of Aquila; the Arrow.