The Collaborative International Dictionary of English v.0.48:

Pubescent \Pu*bes"cent\ (p[-u]"b[e^]s"sent), a. [L. pubescens,
   -entis, p. pr. of pubescere to reach puberty, to grow hairy
   or mossy, fr. pubes pubes: cf. F. pubescent.]
   1. Arrived recently at puberty.
      [1913 Webster]

            That . . . the men (are) pubescent at the age of
            twice seven, is accounted a punctual truth. --Sir T.
                                                  Browne.
      [1913 Webster]

   2. Covered with pubescence, or fine short hairs, as certain
      insects, and the leaves of some plants.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pubescent
    adj 1: (of animals especially human beings) having arrived at
           the onset of puberty (the age at which sex glands become
           functional) but not yet fully mature; "the budding
           breasts of a pubescent girl and the downy chin of
           pubescent boy"
    2: covered with fine soft hairs or down; "downy milkweed seeds"
       [syn: downy, pubescent, puberulent, sericeous]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "pubescent":
   adolescent, attenuate, attenuated, bristly, bushy, cirrose, dainty,
   delicate, downy, feathery, filmy, fine, fine-drawn, fine-grained,
   finespun, fleecy, flocculent, flossy, fluffy, furry, fuzzy, gauzy,
   gossamer, gossamery, hairy, hirsute, hispid, lanate, matted,
   maturescent, nubile, pilose, refined, satin, satiny, shagged,
   shaggy, silky, smooth, thin-spun, unshorn, velutinous, velvety,
   wiredrawn, woolly