Caucasian walnut cau·ca·sian·walnut uncommon noun 1. medium-sized Caucasian much-branched tree distinguished from other walnut trees by its winged fruit SynonymsCaucasian walnutPterocarya fraxinifolia Related words Broader terms wing nut WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
