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ink sac

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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.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ink sac

Historical Examples

  • The ink taken from the ink-sac of Sepia is an article of commerce.

    The Sea-beach at Ebb-tide

    Augusta Foote Arnold

  • They are without an ink-sac, and have the foot divided into lobes bearing sheathed tentacles.

    The Sea-beach at Ebb-tide

    Augusta Foote Arnold

  • The ink-sac, absent in Nautilus, is a rectal caecum developed from its dorsal wall.

  • In certain cases remains of the arms provided with hooks, and of the ink-sac, have been recognized.