natural gender

noun, Grammar
1.
gender based on the sex or, for neuter, the lack of sex of the referent of a noun, as English girl (feminine) is referred to by the feminine pronoun she, boy (masculine) by the masculine pronoun he, and table (neuter) by the neuter pronoun it.
British Dictionary definitions for natural gender

natural gender

noun
1.
grammatical gender that reflects, as in English, the sex or animacy of the referent of a noun rather than the form or any other feature of the word