Lewis & Short

arbustus, a, um, adj. [arbos, arbor].

  1. I. Set or planted with trees: ager, * Cic. Rep. 5, 2: locus, Col. 3, 13, 6; Plin. 10, 29, 41, § 77.
  2. * II. Arbusta vitis for arbustiva, fastened to or trained upon a tree, Plin. 17, 23, 35, § 207.
    * Comp.: arbustiores res, trop., firmer, surer, more settled circumstances (the figure drawn from vines, which are supported on trees more firmly than upon frames), Tert. adv. Marc. 2, 29.