Achillean (also known as Men Loving Men (MLM), Apollian and Chaeronean) refers to men or masculine-aligned person who is attracted to other men or men-aligned people. This attraction doesn't have to be exclusive, as the label is used in a way to unify all men who love other men such as gay (vincian) men, bisexual men, pansexual men, etc, promoting solidarity among men of all identities. Since achillean is an umbrella term, it is typically not used as an identity on it's own, however it can be if desired.
He is in an achillean relationship

They are achillean
by luqqs September 5, 2020
The gay-men equivalent of "Sapphic". A term describing a gay man or gay relationship, usually sexual in connotation.
Comes from the Greek hero Achilles, who was well-known for having male lovers.
See Sapphic
Andrew is a pig; he says achillean love is disgusting, but "encourages" sapphic love.
by felicitousFeline December 11, 2016
umbrella term non women attracted to non women, opposite of sapphic. sexualities under this umbrella are gay, bi (not bi women), pan (not pan women) etc.
person 1: i'm achillean
person 2: cool
by aasdgj7y6 September 25, 2021