–noun, plural (especially collectively) -fish, (especially referring to two or more kinds or species) -fish⋅es.
any of several cephalopods, esp. of the genus Sepia, having eight arms with suckers and two tentacles, and ejecting a black, inklike fluid when in danger.
Origin: 1400–50; late ME codel, OE cudele cuttlefish + fish
(click for larger image in new window) n.
pl.cuttlefish or cut·tle·fish·es Any of various squidlike cephalopod marine mollusks of the genus Sepia that have ten arms and a calcareous internal shell and eject a dark inky fluid when in danger.
[Middle English codel, cotil, cuttlefish (from Old English cudele) + fish.]