(Zool.) Any large holothurian, especially one of those belonging to the genus Pentacta, or Cucumaria, as the common American and European species. (Pentacta frondosa). [ 1913 Webster ]
[なまこ(gikun);かいそ;こ(ok);ナマコ, namako (gikun); kaiso ; ko (ok); namako](n) (uk) (often translated as "sea slug" in anglicized haikus) (See 海牛・うみうし) sea cucumber (Holothuroidea spp.)[Add to Longdo]