puberulent

also pu·ber·u·lous (-bĕr'yə-ləs, -bĕr'ə-)
adj.
Covered with minute hairs or very fine down; finely pubescent.

[Latin pūber, downy, adult + -ulentus, abounding in.]

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The adjective has one meaning:

Meaning #1: (biology) covered with fine soft hairs or down
  Synonyms: downy, pubescent, sericeous

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