The Collaborative International Dictionary of English v.0.48:

Greenwood \Green"wood`\, n.
   A forest as it appears in spring and summer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Greenwood \Green"wood`\, a.
   Pertaining to a greenwood; as, a greenwood shade. --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Woad-waxen \Woad"-wax`en\, n. [Cf. Wood-wax.] (Bot.)
   A leguminous plant (Genista tinctoria) of Europe and
   Russian Asia, and adventitious in America; -- called also
   greenwood, greenweed, dyer's greenweed, and whin,
   wood-wash, wood-wax, and wood-waxen.
   [1913 Webster]

WordNet (r) 3.0 (2006):

greenwood
    n 1: woodlands in full leaf; "the greenwood was Robin Hood's
         home"