The neuter is one of three genders in Greek. It is important not to think of this grammatical feature as biological at all. It is grammatical — and simply that. Some things that are biologically masculine or feminine are neuter according to Greek grammatical gender.

The forms of the neuter are provided on the chart below for case endings, articles, and relative pronouns. Note how closely related the forms are. The red letters or breathing marks and accents indicate what is added to the case endings to form the articles and the relative pronouns. The faded letters indicate what letters are dropped.