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Definition of: nudibranch
Our photo definition of nudibranch 
(n
′di·brangk, ny′-) noun
Any of various brightly colored marine gastropods (suborder Nudibranchia) lacking shells and true gills in the adult stage. Also called sea slug. [<NUDI- + Gk. branchia gills]
—nu′di·bran′chi·ate (-brang′kē·it) adjective & noun
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