- a mill for rolling ingots into blooms.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for blooming mill
Fifty yards from the base was the blooming-mill, where the metal was being rolled into great oblong shapes called "blooms."
I walked the four hundred yards to the open-hearth, and noticed clearly for the first time the yard of the blooming-mill.
Trainloads of them pass daily out of the pit to the blooming-mill, to catch their first transformation.