Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* 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.