sagitta
 天箭座


 Sa·git·ta n.
 1. Astron. A small constellation north of Aquila; the Arrow.
 2. Arch. The keystone of an arch. [R.]
 3. Geom. 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. [Obs.]
 4. Anat. The larger of the two otoliths, or ear bones, found in most fishes.
 5. Zool. 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.

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