Culicifuge: any preparation for driving away gnats or mosquitoes.
Culmen: the longitudinal carina of a caterpillar.
Cultellus: one of the blade-like lancets in piercing flies: = the mandibles of some authors.
Cultrate -iform: shaped like a pruning knife.
Cumulate: in groups or heaps.
Cumulus: a group or heap; as of cells in a developing ovum.
Cuneate, Cuneiform: wedge-shaped; elongate triangular.
Cuneus: Hymenoptera; the small triangular area at the end of the embolium of hemelytra: Odonata, the small triangle of the vertex between the compound eyes.
Cupreous: the metallic red of pure shining copper.
Cupules: the sucker-like processes covering the under surface of the tarsi in male Dytiscidce.