The Collaborative International Dictionary
Elaphrium tomentosum
Tacamahac \Tac"a*ma*hac`\, Tacamahaca \Tac`a*ma*ha"ca\, n.
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.
(Bot.) Any tree yielding tacamahac resin, especially, in North America, the balsam poplar, or balm of Gilead ( Populus balsamifera).