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ink sac

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
ink sac
n.
An ink-containing organ located near the rectum in most cephalopods, including the octopus, squid, and cuttlefish.


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Inside cells around the organ--as well as in the skin, in the ink sac, and around the eyes--are reflective, iridescent structures that resemble stacks of coins.
Reflective protein causes squid to shimmer by Goho, A. / Science News
When threatened, the squid squirts a mixture of dark ink and mucus from its ink sac out through its funnel.
Inside a squid by Science World
Taking the quill-like inner skeleton, King had the pupils dip the end into the squid's ink sac and write their names on the diagrams they used as guides.
STUDENTS LEARN ABOUT SEA LIFE BY DISSECTING, TASTING SQUIDS by Daily News (Los Angeles, CA)
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