The Collaborative International Dictionary
Tumblerful \Tum"bler*ful\, n.; pl. Tumblerfuls. As much as a tumbler will hold; enough to fill a tumbler.
Wiktionary
n. As much as a tumbler will hold.
Usage examples of "tumblerful".
He poured half a tumblerful into a soup-plate, and held it out to the mare, who, never snuffing at it, licked it up greedily, and immediately started of herself at a good pace.
You inserted in that jug--shall we say a tumblerful of the right stuff?
The tumblerfuls were generous ones and the raspberry cordial was certainly very nice.
I just told her plainly that currant wine wasn't meant to be drunk three tumblerfuls at a time and that if a child I had to do with was so greedy I'd sober her up with a right good spanking.
Thus he obtained not much less than two tumblerfuls of wine that, as I have said, was stronger than port.