Dilution: much thinned out or diluted.
Dimera: forms with two-jointed tarsi: specifically applied to some groups of Homoptera.
Dimerous: having only two tarsal joints.
Dimidiate -us: halved; extending half way around; applied to elytra when they cover only half the abdomen.
Dimidius: of half length.
Dimorphic: occurring in two well-marked forms.
Dimorphism: a difference in form, color, etc, between individuals of the same species, characterizing two distinct types: may be seasonal, sexual or geographic.
Dioecious: with distinct sexes.
Dioptrate: an ocellate spot with the pupil divided by a transverse line.
Dioptric: with a transversely divided ocellus.