English
fixer
From fix + -er.
A compound of fix + -er
Proto-Indo-European *dʰeygʷ- ‘to jab’
…
Latin fīxus ‘immovable’
Old French fix ‘fastened’
Old French *fixer
Middle English fixen
English fix
Today it means
noun A chemical (sodium thiosulfate) used in photographic development that fixes the image in place, preventing further chemical reactions.
Language periods are conventional ranges, not dates for this word.
Etymograph / fixer