The Collaborative International Dictionary of English v.0.48:
greenwing \green"wing\ n. The common teal (Anas crecca) of Eurasia and North America. Syn: green-winged teal, Anas crecca. [WordNet 1.5]WordNet (r) 3.0 (2006):
greenwing n 1: common teal of Eurasia and North America [syn: greenwing, green-winged teal, Anas crecca]