the first prong from the base of a stag's antler.
Origin of brow antler
First recorded in 1590–1600
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for brow antler
They stand more upright, have fewer branches, and want the brow-antler.
Usually the tail is long, and the brow-antler is always wanting.The Animal World, A Book of Natural History|Theodore Wood