noun, plural ailanthuses.
any tree belonging to the genus Ailanthus, of the quassia family, especially A. altissima, widely grown in cities.
Compare tree of heaven.

1788; < Neo-Latin Ailantus, Ailanthus (th by association with Greek ánthos flower) < Central Moluccan ai lanit(o), ai lanit(e), equivalent to ai tree, wood + lanit sky + -o, -e a definite article

ailanthic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ailanthus (eɪˈlænθəs)
n , pl -thuses
Also called: tree of heaven an E Asian simaroubaceous deciduous tree, Ailanthus altissima, planted in Europe and North America, having pinnate leaves, small greenish flowers, and winged fruits
[C19: New Latin, from native name (in Amboina) ai lanto tree (of) the gods]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"tree of heaven," 1807, Mod.L., from Amboyna ailanto "tree of the gods;" spelling alt. by infl. of Gk. anthos "flower" (see anther).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
From this small beginning, and faster than an ailanthus tree in a vacant lot, a giant scandal grows.
Two towering ailanthus trees adopted it and now grow tall and proud.
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