'Dicyemata' definitions:

Definition of 'Dicyemata'

From: GCIDE

Dicyemata \Di`cy*e"ma*ta\, n. pl. [NL., fr. Gr. di- = di`s- twice + ? an embryo.] (Zool.) An order of worms parasitic in cephalopods. They are remarkable for the extreme simplicity of their structure. The embryo exists in two forms. [1913 Webster]