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n. The keystone of an arch.

n. 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.

n. The larger of the two otoliths, or ear bones, found in most fishes.

"Patroclus; he was even tempted to believe with Sextus that the name iatros, medicus, was derived from ios, which in the older times signified "sagitta," and that the earliest function of our professional ancestors was the extraction of arrows and darts."

constellation    chaetognath    arrowworm   

Sagittarius    Sagittaria   

Sagittae