mucro

A sharp, pointed part or organ, especially a sharp terminal point, as of a leaf or shell.

A tip; a spine or spine-like process; a mucronate part or organ; a sharp tip or point.

Specifically

In entomology, an angular projection on the margin or surface of a hard part, as on the thighs or the tips of the elytra; an angular process shorter than a spine

In botany, a short and abrupt point of a leaf or other organ.

A minute abrupt point, as of a leaf; any small, sharp point or process, terminating a larger part or organ.

A pointed end, often sharp, abruptly terminating an organ, such as a projection at the tip of a leaf; the posterior tip of a cuttlebone; or the distal part of the furcula in Collembola.