noun
sac
sak
noun
1
A pouch-like structure in a plant or animal, usually containing fluid.
"The venom sac sits just behind the snake's fangs."
"A yolk sac supplies nutrients to the developing embryo."
How to Use Sac
Learner’s notesIn plain EnglishA small bag-like pouch inside a living thing, usually holding liquid.
Common mistake
Not to be confused with "sack," a bag for carrying goods — "sac" is the biological term.
Easily confused with
Common pairings
venom sac
yolk sac
air sac
Word Forms
sacked past tense, sacced past tense, sacs plural, sacs plural, sacs singular
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Fill the Gap
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The venom _____ sits just behind the snake's fangs.
Etymology
From Latin saccus ("bag"), the same root that gives us "sack."