Definiciones
1.NounThe keystone of an arch.
2.NounThe 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.
3.NounThe larger of the two otoliths, or earbones, found in most fishes.
4.NounAny arrowworm, of the genus Sagitta.