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[ahr-buh-ree-tuh m] /ˌɑr bəˈri təm/
noun, plural arboretums, arboreta
[ahr-buh-ree-tuh] /ˌɑr bəˈri tə/ (Show IPA)
a plot of land on which many different trees or shrubs are grown for study or display.
Origin of arboretum
1830-40; < Latin arborētum a plantation of trees, equivalent to arbor tree + -ētum suffix denoting place where a given plant grows (cf. alameda) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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noun (pl) -ta (-tə), -tums
a place where trees or shrubs are cultivated for their scientific or educational interest
Word Origin
C19: from Latin, from arbor tree
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for arboretum

"tree-garden," 1838, from Latin arboretum, literally "a place grown with trees," from arbor "tree," of unknown origin, + -etum, suffix used to form the names of gardens and woods.

Online Etymology Dictionary, © 2010 Douglas Harper
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