'Hackmatack' definitions:

Definition of 'hackmatack'

(from WordNet)
noun
Poplar of northeastern North America with broad heart- shaped leaves [syn: balsam poplar, hackmatack, tacamahac, Populus balsamifera]

Definition of 'Hackmatack'

From: GCIDE
  • Hackmatack \Hack"ma*tack`\ (h[a^]k"m[.a]*t[a^]k`), n. [Of American Indian origin.] (Bot.) The American larch (Larix Americana), a coniferous tree with slender deciduous leaves; also, its heavy, close-grained timber. Called also tamarack. [1913 Webster]