ullage
 oxford
 views  updated May 29 2018ullage amount by which a cask or bottle falls short of being full. XV (
oylage, 
ulage). — AN. 
ulliage = OF. 
ouillage, 
œillage, f. (O)F. 
ouiller, 
eullier, 
œiller fill up (a barrel):- Gallo-Rom. *
oculāre, f. L. 
oculus EYE, used in the sense of bung-hole; see 
-AGE.
  The Concise Oxford Dictionary of English Etymology T. F. HOAD
   ullage
 oxford
 views  updated May 21 2018ullage Liquid left in cask or bottle after some has been removed.
  A Dictionary of Food and Nutrition DAVID A. BENDER