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ink sac

noun
1.
a large gland in most cephalopods, as the cuttlefish, octopus, and squid, that is near the rectum and ejects ink at predators.
2.
a flexible structure containing ink.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for ink sac
  • The core of the organ where the bacteria live is surrounded by a reflective layer of tissue and part of the squid's ink sac.

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