Noun
ink sac (plural ink sacs)
(zoology) A muscular bag found in certain cephalopods used to generate ink.
After a fortnight little is left but a blob with eyes, arms and ink sac visible. Source: Internet
Beside the rectum is the ink sac, which allows a squid to rapidly discharge black ink into the mantle cavity. Source: Internet
The Sheaffer "Snorkel" system filled the ink sac through a retractable tube above and behind the pen point. Source: Internet
The ink sac solidifies around this point. Source: Internet
The kidneys are difficult to identify and stretch from the hearts (located at the posterior side of the ink sac) to the liver. Source: Internet
The nib is immersed in ink, the plunger is pushed in, compressing and then releasing the ink sac by means of air pressure. Source: Internet