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

  • n. An ink-containing organ located near the rectum in most cephalopods, including the octopus, squid, and cuttlefish.

from the GNU version of the Collaborative International Dictionary of English

  • n. an organ, found in most cephalopods, containing an inky fluid which can be ejected from a duct opening at the base of the siphon. The fluid serves to cloud the water, and enable these animals to escape from their enemies. See Illust. of Dibranchiata.


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