The Collaborative International Dictionary of English v.0.48:

Verdant \Ver"dant\, a. [F. verdoyant, p. pr. of verdoyer to be
   verdant, to grow green, OF. verdoier, verdeier, fr. verd,
   vert, green, fr. L. viridis green, fr. virere to be green:
   cf. OF. verdant verdant, L. viridans, p. pr. of viridare to
   make green. Cf. Farthingale, Verjuice, Vert.]
   1. Covered with growing plants or grass; green; fresh;
      flourishing; as, verdant fields; a verdant lawn.
      [1913 Webster]

            Let the earth
            Put forth the verdant grass.          --Milton.
      [1913 Webster]

   2. Unripe in knowledge or judgment; unsophisticated; raw;
      green; as, a verdant youth. [Colloq.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

verdant
    adj 1: characterized by abundance of verdure