arbŏrētum, i, n. [arbor], i. q. arbustum, but an inferior word,
a place grown with trees : arboreta ignobilius verbum est, arbusta celebratius, Quadrig. ap. Gell. 17, 2, 25.
·noun A place in which a collection of rare trees and shrubs is cultivated for scientific or educati...
Webster's Dictionary of the English Language