ullagern.
Etymology: < ullage v.Previous versions of the OED give the stress as: ˈullager.
the world > relative properties > measurement > the scientific measurement of volume > measure(s) of capacity > [noun] > liquid measure of capacity > specific units of liquid measure > barrel or cask as unit > one who
1885 W. Ecockes (title) The Ullager's Pocket Gem, comprising tables for finding the ullages of casks.
This entry has not yet been fully updated (first published 1921; most recently modified version published online June 2019).