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English definition of “sac”

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sac

noun [C] uk   /sæk/ us  

sac noun [C] (bag of liquid)

specialized biology a part of a plant or animal that is like a bag and often contains liquid

sac noun [C] (swollen area)

specialized medical a type of abscess (= swollen area containing a thick yellow liquid) under the skin

sac noun [C] (TUMOUR)

specialized medical a covering that surrounds a tumour
(Definition of sac from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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