Noun

1. A youth in the state of adolescence, or just passing from boyhood to manhood; a lad.
   • 1879: Robert Louis Stevenson, Travels with a Donkey in the Cévennes, Chapter 6

     For there, upon the narrow new-made road, between the stripling pines, was a mediaeval friar, fighting with a barrowful of turfs.

2. A juvenile between the onset of puberty and maturity (syn: adolescent, teenager).