The Collaborative International Dictionary of English v.0.48:
nonarboreal \nonarboreal\ adj. not arboreal; not living in trees; -- of animals. Opposite of arboreal. [WordNet 1.5]WordNet (r) 3.0 (2006):
nonarboreal adj 1: not inhabiting or frequenting trees [ant: arboreal, arboreous, tree-living]