(?), n. [L., an arrow.] 1. (Astron.) A small constellation north of Aquila; the Arrow.
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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. (Zol.) 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 Chtognatha.
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Wed 21st April 2021