Sagitta

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A constellation in the Northern Hemisphere near Aquila and Vulpecula.

Century Dictionary and Cyclopedia

1. n. [capitalized] An insignificant but very ancient northern constellation, the Arrow, placed between Aquila and the bill of the Swan. It is, roughly speaking, in a line with the most prominent stars of Sagittarius and Centaurus, with which it may originally have been conceived to be connected. Also called Alahance.
2. n. In anatomy, the sagittal suture.
3. n. In ichthyology, one of the otoliths of a fish's ear.
4. n. [capitalized] The typical genus of Sagittidæ, formerly containing all the species, now restricted to those with two pairs of lateral fins besides the caudal fin. Also Saggitta, Saggita, Sagita. See accompanying cut.
5. n. An arrow-worm or sea-arrow; a member of the Sagittidæ.
6. n. The keystone of an arch.
7. n. In geometry: The versed sine of an arc: so called by Kepler because it makes a figure like an arrow upon a bow.
8. n. The abscissa of a curve.

Wiktionary

1. n. astronomy A small autumn constellation of the northern sky, said to resemble an arrow. It lies between the constellations of Vulpecula and Aquila.

GNU Webster's 1913

1. n. (Astron.) A small constellation north of Aquila; the Arrow.
2. n. (Arch.), rare The keystone of an arch.
3. n. (Geom.), obsolete 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.
4. n. (Anat.) The larger of the two otoliths, or ear bones, found in most fishes.
5. n. (Zoöl.) A genus of transparent, free-swimming marine worms having lateral and caudal fins, and capable of swimming rapidly. It is the type of class Chætognatha.

WordNet 3.0

1. n. a small constellation in the northern hemisphere between Cygnus and Aquila and crossed by the Milky Way
2. n. any arrowworm of the genus Sagitta