o·pis·tho·branch 
(ə-pĭsthə-brăngk′)
(ə-pĭsthə-brăngk′)n. pl. o·pis·tho·branchs
Any of a group of marine gastropods characterized by gills located behind the heart, a shell that is reduced or absent, and two pairs of tentacles, and including the sea slugs and the sea butterflies.
[From New Latin Opisthobranchia, former subclass name : Greek opistho-, behind; see OPISTHOGNATHOUS + Greek brankhia, gills.]
- logic
- logical
- logical atomism
- logical empiricism
- logical form
- logicality
- logically
- logicalness
- logical operation
- logical operator
- logical positivism
- logic bomb
- logic circuit
- logic gate
- logician
- logic operation
- logic operation
- logic operator
- logic operator
- login
- log in
- log in (or on)
- logion
- logistic
- logistical