Rule of Natural Gender.—Nouns denoting male persons are masculine, nouns denoting female persons are feminine. Thus, ὁ ναύτης
a. A whole class is designated by the masculine: οἱ ἄνθρωποι
b. EXCEPTIONS TO THE RULE OF NATURAL GENDER.—Diminutives in -ιον are neuter ( cross199 d), as τὸ ἀνθρώπιον
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].