|n.||1.||(Zool.) In the antler of a stag, the third tyne above the base. This tyne appears in the third year. In those deer in which the brow tyne does not divide, the tres-tyne is the second tyne above the base. See Illust. under Rucervine, and under Rusine.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.