Latin = hook; adjective - uncinate.

(biology) any hook-shaped process or part

In Chalcidoidea, a short, narrow stub near the apex of the stigmal vein directed towards the postmarginal vein.

(L. hook): The enlarged anteromedial end of the parahippocampal gyrus that overlies the amygdala.

Hook-shaped projections at the tip of the male abdomen used for securing the female during mating

The uncus is the hook-shaped, downward-pointing end of the vein on the wing of male butterflies and moths.