• (n.) The edge of the aperture of a univalve shell. • (n.) That part of the integument of an insect which surrounds the spiracles.
Elongated sclerite extending forward from the stigma of certain mites, mainly in the suborder Mesostigmata.
Per'i·treme noun [ Prefix peri- + Greek ... a hole.] (Zoology) (a) That part of the integument of an insect which surrounds the spiracles. (b) The edge of the aperture of a univalve shell.