The keystone of an arch.
The distance from a point in a curve to the chord; also, the versed sine of an arc; (ngd).
The larger of the two otoliths, or earbones, found in most fishes.
Any arrowworm, of the genus ''Sagitta''.
an arrow, shaft, bolt
(Q); (w).)
the extreme thin part of a vine branch or shoot
the arrowhead (gl)
a lancet (gl)