Fen

Irregular plural of "fan". (Man is to men as fan is to fen. But fans is okay while mans isn't. Go figure.) Also neofan/neofen.

from Fancyclopedia 2 ca. 1959

Plural of fan, by analogy with man/men; it came into wide use after a Maine conference solemnly voted its adoption. But the term is not universally accepted, and some dislike it.

from Fancyclopedia 1 ca. 1944

Alternative plural for "fans", which came into general use after the Mecon solemnly voted its adoption.