Plural of vas, meaning blood vessels or ducts in the body, especially referring to the vas deferens (the tube carrying sperm).
From Latin 'vas' meaning vessel or duct; medical terminology uses the Latin plural form 'vasa' when referring to multiple vessels or ducts.
The term 'vas deferens' literally means 'the vessel that carries away,' and it's one of the few pieces of medieval anatomy that actually had a good functional description built into its Latin name, showing that medieval physicians carefully observed what they were describing.
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