Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various sedentary tunicates of the class Ascidiacea, having a transparent sac-shaped body with two siphons. Also called ascidian.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any sessile tunicate, of the class Ascidiacea, which squirts water from two openings when touched; they are filter feeders

from the GNU version of the Collaborative International Dictionary of English

  • An ascidian. See Illust. under tunicata.

from The Century Dictionary and Cyclopedia

  • n. Any ascidian or tunicate: so called from their squirting water when they contract.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. ascidian that can contract its body and eject streams of water

Etymologies

From its habit of squirting water when disturbed.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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