I. ˈsak noun
( -s )
Etymology: French, literally, bag, from Latin saccus — more at sack
1. : a pouch within an animal or plant ; specifically : a soft-walled cavity usually having a narrow opening or none at all and containing in many cases a special fluid
a synovial sac
a lachrymal sac
2. : sack 5
II.
Usage: usually capitalized
variant of sauk