The Collaborative International Dictionary of English v.0.48:
Empetrum \Empetrum\ prop. n. A genus of heathlike shrubs including the crowberry (Empetrum nigrum). Syn: genus Empetrum. [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
Empetrum n 1: crowberries [syn: Empetrum, genus Empetrum]