sea cucumber

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various cucumber-shaped echinoderms of the class Holothuroidea, characteristically having tentacles surrounding the mouth and a flexible body with tube feet usually arranged in longitudinal rows.

from The Century Dictionary.

• noun Some or any holothurian; a trepang or bêche-de-mer: also called sea-pudding, etc.

from the GNU version of the Collaborative International Dictionary of English.

• (Zoöl.) Any large holothurian, especially one of those belonging to the genus Pentacta, or Cucumaria, as the common American and European species. (P. frondosa).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun an echinoderm of the class Holothuroidea, with an elongated body and leathery skin.

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

• noun echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders