The Collaborative International Dictionary of English v.0.48:
birchbark \birch"bark`\ n. a canoe made with the bark of a birch tree. Syn: birchbark canoe. [WordNet 1.5]WordNet (r) 3.0 (2006):
birchbark n 1: a canoe made with the bark of a birch tree [syn: birchbark canoe, birchbark, birch bark]