nymphette

nymphette (n.): also nymphet, nymphete, "sexually attractive young girl," 1955, introduced by Vladimir Nabokov (1899-1977) in his novel "Lolita" to describe alluring (in the eyes of some men) girls age 9 to 14; from nymph + diminutive suffix. Used from 17c. in sense "a little nymph."