"sacs" in the noun sense
1. pouch, sac, sack, pocket
an enclosed space
"the trapped miners found a pocket of air"
2. theca, sac
a case or sheath especially a pollen sac or moss capsule
3. Sauk, Sac
a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay
a structure resembling a bag in an animal
Source: WordNet® (An amazing lexical database of English)
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