A nymphet is a young girl that a writer or speaker treats as very sexually attractive. It is not a kind everyday word, and it is not a compliment. It is built from nymph — in old Greek stories, a beautiful young woman or a spirit of woods and water — plus a little ending -et, so it first meant a small nymph. People used that older, fairy-tale sense from the early 1600s. The sense you will meet now was made famous by Vladimir Nabokov’s 1955 novel Lolita. In that book, and in talk that followed it, a nymphet is a girl who is still a child, or only just growing up, seen through an adult’s sexual eyes. That is why the word feels heavy: it is about looking at a young girl in a sexual way. You will find it in novels, film talk, and essays, almost never in warm daily speech. Do not use it about a real girl.

性感少女（文學用語，出自納博科夫小說《蘿莉塔》；帶物化意味，日常不要拿來叫人）