ascidian Meaning, Definition & Usage

  1. noun minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves

WordNet

As*cid"i*an noun
Etymology
Gr. bladder, pouch.
Definitions
  1. (Zoöl.) One of the Ascidioidea, or in a more general sense, one of the Tunicata. Also as an adj.

Webster 1913