American Heritage® Dictionary of the English Language, Fourth Edition
- n. An ink-containing organ located near the rectum in most cephalopods, including the octopus, squid, and cuttlefish.
GNU Webster's 1913
- n. (Zoöl.) 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
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