Etymology
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potable (adj.)

"drinkable, suitable for drinking," early 15c., from Old French potable (14c.) and directly from Late Latin potabilis "drinkable," from Latin potare "to drink" (from PIE root *po(i)- "to drink").

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Definitions of potable
1
potable (n.)
any liquid suitable for drinking;
Synonyms: beverage / drink / drinkable
2
potable (adj.)
suitable for drinking;
Synonyms: drinkable
From wordnet.princeton.edu