2 definitions found From WordNet (r) 2.0 [wn]: nudibranch noun: any of various marine gastropods of the suborder Nudibranchia having a shell-less and often beautifully colored body [syn: {sea slug}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Nudibranch \Nu"di*branch\, adjective (Zo["o]l.) Of or pertaining to the Nudibranchiata. -- n. One of the Nudibranchiata.

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