A lot vs. Alot: 9 Grammatical Pitfalls
1610s, a back-formation from pubescence, or else from French pubescent (early 16c.) or directly from Latin pubescentem (nominative pubescens), present participle of pubescere "to reach puberty" (see pubescence).
pubescent pu·bes·cent (pyōō-běs'ənt)
Reaching or having reached puberty.
Covered with fine short hairs.