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Meaning of 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.