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ink sac

noun
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Definition of ink sac

: an organ in most cephalopods (as the squid) secreting an inky fluid that can be ejected from a duct opening into the terminal part of the rectum

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“Ink sac.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/ink%20sac. Accessed 11 December 2019.

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