ullage

noun

ul·​lage ˈə-lij 

: the amount that a container (such as a tank or cask) lacks of being full

Examples of ullage in a Sentence

Recent Examples on the Web

Russia used these ullage motors to help accelerate the parent rocket stages slightly, according to Jonathan McDowell. —Joshua Hawkins, BGR, 6 May 2022

Hundreds of milliseconds later, eight ullage motors on the interstage, still attached to the S-II second stage, fired. —Amy Shira Teitel, Discover Magazine, 15 Jan. 2018

Word History

Etymology

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, in the meaning defined above