n. pl. [ NL., from Gr. &unr_;&unr_;&unr_;&unr_; channel + &unr_;&unr_;&unr_;&unr_;, &unr_;&unr_;&unr_;&unr_;, stomach. ] (Zool.) An order of lowly organized Mollusca belonging to the Isopleura. A narrow groove takes the place of the foot of other gastropods. [ 1913 Webster ]