{ } n. 1. A bitter balsamic resin obtained from tropical American trees of the genus Elaphrium (Elaphrium tomentosum and Elaphrium Tacamahaca), and also from East Indian trees of the genus Calophyllum; also, the resinous exhudation of the balsam poplar. [ 1913 Webster ]

2. (Bot.) Any tree yielding tacamahac resin, especially, in North America, the balsam poplar, or balm of Gilead (Populus balsamifera). [ 1913 Webster ]