The acad-emetic version. I'm completely blanking on a word that will fit in place of "seminal" that does not have to do with semen. Influential, major, formative, groundbreaking, important . . . none of these work.
I'm writing about gendered images and myth-building, so there's no way I can use "seminal" unironically or pretend it just has to do with "seed". And I can't use it ironically either.
Stupid sexist language.
ETA: I think I might just back up a bit and go with "iconic". It's missing some of the oomph, but at least it's not metaphorically filled with jizz.