Definition of ullage
: the amount that a container (as a tank or cask) lacks of being full
Origin of ullage
Middle English ulage, from Anglo-French ulliage, from *ullier to fill a partially empty cask, from Old French (Picard dialect) oel bunghȯle, literally, eye, from Latin oculus eye — more at eye
First Known Use: 15th century
Rhymes with ullage
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