Etymology
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sac (n.)

"biological pocket or receptacle," 1741, from French sac, from Latin saccus "bag" (see sack (n.1)). English sack for "a sack-like part of the body" is from mid-14c.

Sac

central Algonquian people who lived near the upper Mississippi before the 1832 Black Hawk War, from French Canadian Saki, probably a shortened borrowing of Ojibwa (Algonquian) /osa:ki:/, literally "person of the outlet" (of the Saginaw River, which itself contains their name, and means literally "in the Sac country").

updated on October 31, 2021

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Definitions of sac from WordNet
1
sac (n.)
an enclosed space;
Synonyms: pouch / sack / pocket
sac (n.)
a case or sheath especially a pollen sac or moss capsule;
Synonyms: theca
sac (n.)
a structure resembling a bag in an animal;
2
Sac (n.)
a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay;
Synonyms: Sauk
From wordnet.princeton.edu, not affiliated with etymonline.