Entry 1 sense Webster, 1913 Thamyn · Tha·myn · IPA 01 n. An Asiatic deer (Rucervus Eldi) resembling the swamp deer; -- called also Eld's deer. 1. An Asiatic deer (Rucervus Eldi) resembling the swamp deer; -- called also Eld's deer.(Zool.) Also: Eld's deer