Plural of sac; small bag-like structures or pouches in living organisms, often containing fluid or other material.
From Latin 'saccus' meaning 'bag' or 'pouch.' The word came into English through Old French and was adopted into medical and biological terminology to describe anatomical structures.
Your lungs, your eyes, your kidneys—they're all basically sophisticated sacs that hold things; the humble sac is one of nature's most repeated structures, proving that sometimes the simplest shape (a flexible bag) solves almost everything.
Complete word intelligence in one call. Free tier — 50 lookups/day.