Search Result for "hackmatack": 
Wordnet 3.0

NOUN (1)

1. poplar of northeastern North America with broad heart-shaped leaves;
[syn: balsam poplar, hackmatack, tacamahac, Populus balsamifera]

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2 definitions retrieved:

The Collaborative International Dictionary of English v.0.48:

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]
WordNet (r) 3.0 (2006):

hackmatack n 1: poplar of northeastern North America with broad heart- shaped leaves [syn: balsam poplar, hackmatack, tacamahac, Populus balsamifera]