Nominsexual is the attraction to everyone except those who are masculine in nature (MIN). "Masculine in nature" includes typically includes men and masculine aligned non-binary people. Depending on the person, it can also include women or non-binary people who present masculinely.
The genders they are attracted to typically include women, feminine aligned non-binary people, neutral or abinary people, agender people, etc. Some nominsexual people might be attracted to men, so long as they present femininely or androgynously.
Similar terms include femaric, neptunic, trixensexual and nomasexual.
The feminine equivalent to nominsexual is nofinsexual.
Etymology
"Min" stands for "masculine in nature", so the prefix nomin- stands for no masculine in nature.