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Noun
1. ink sac (in cephalopods)Zoology
Wikipedia definition
2. Ink sacWith the exception of nocturnal and very deep water cephalopods, all coeloids which dwell in light conditions have an ink sac, which can be used to expel a cloud of dark ink to confuse predators. This sac is a muscular bag which originated as an extension of the hind gut.
Read “Ink sac” on English Wikipedia
Read “墨袋” on Japanese Wikipedia
Read “Ink sac” on DBpedia

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