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The Collaborative International Dictionary of English v.0.48 (gcide)

Sagitta \Sa*git"ta\, n. [L., an arrow.]
1. (Astron.) A small constellation north of Aquila; the
Arrow.
[1913 Webster]

2. (Arch.) The keystone of an arch. [R.] --Gwilt.
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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.]
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4. (Anat.) The larger of the two otoliths, or ear bones,
found in most fishes.
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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.
[1913 Webster]

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