What is the meaning of the word "sac"?

Definitions:

  1. In biology, refers to a pouch or bag-like structure in an animal or plant, often containing fluids or other substances. copy to clipboard NOUN
    • The amniotic sac protects the developing fetus. copy to clipboard
  2. May refer to a pouch or bag to carry items. copy to clipboard NOUN
    • The hikers packed their essentials into a sturdy hiking sac. copy to clipboard

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