Wiktionary
half gross
n. (context historical English) seventy-two.
Usage examples of "half gross".
All the more so since you have made me a half gross billion Ke richer!
But then the time seemed to drag, for there was much work to be done in the casting of type and the printing of the half gross of pages that the magazine would contain, and none of it could be done by me.
The alcoholic bass voice dissolved in a chuckle, half agony, half gross obscenity.
A village belle had twisted her hair into ringlets and then so stiffened it with fat and oil that it looked as though she had bored a half gross of corkscrews through her skull from within and left them standing up around her head.