noun Date: 1927 a physical characteristic (as the breasts of a female mammal or the breeding plumage of a male bird) that appears in members of one sex at puberty or in seasonal breeders at the breeding season and is not directly concerned with reproduction
SECONDARY SEX CHARACTERISTIC
Meaning of SECONDARY SEX CHARACTERISTIC in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012