- Admiral William Smyth's Sailor's Word Book, 1867
Ullage of a cask is what such a vessel wants of being full.
- Edward Phillips' New World of English Words, 1706
The quantity of liquor contained in a cask partially filled, and the cpacity of the portion which is empty, are termed respectively the wet and dry ullage.
- Encylopedia Britannica, 1883
To Calculate the amount of ullage in a cask. To fill up again an ullaged cask.
- Sir James Murray's New English Dictionary, 1926