The Collaborative International Dictionary of English v.0.48:

Dumose \Du`mose"\, Dumous \Du"mous\, a. [L. dumosus, fr. dumus a
   thornbush, a bramble.]
   1. Abounding with bushes and briers.
      [1913 Webster]

   2. (Bot.) Having a compact, bushy form.
      [1913 Webster]