A doctor assigns a person’s sex at birth based on the appearance of their external genitalia.
In particular, it is now sometimes considered offensive to write cisman or cis-man, the preferred spelling being cis man ( cis man). In other cases, the related standalone adjective cis is used: hence one speaks of a cis perspective (not * cisperspective), etc.
In the gender-related senses, this prefix is attached directly to certain words, most notably cisgender and cissexual (which are almost always spelled thus, not as e.g. In the first sense, 'on this side of', this prefix is usually attached directly to the word it modifies, or sometimes separated from it by a hyphen: cisrhenane, cis-Neptunian.
