Salix alba sa·li·xalba uncommon noun 1. large willow tree of Eurasia and North Africa having grayish canescent leaves and gray bark Synonymswhite willowHuntingdon willowSalix alba Related words Word family Salix alba caeruleaSalix alba sericeaSalix alba vitellina Broader terms willow Parts Salix WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.