Merriam-Webster Collegiate Dictionary - ailanthus

 noun  Etymology: New Latin, from Kamarian (Austronesian language of the Piru Bay region, Seram) ai lanito, literally, the sky tree, or from a cognate phrase in a related central Moluccan language  Date: 1807 any of a small Asian genus (Ailanthus of the family Simaroubaceae, the ~ family) of chiefly tropical trees and shrubs with bitter bark, pinnate leaves, and terminal panicles of ill-scented greenish flowers; especially tree of heaven