English
acylium
From acyl + -ium.
A compound of acyl + -ium
Proto-Indo-European *h₂eḱ- ‘sharp’
Proto-Indo-European *h₂eḱéh₁yeti
Proto-Italic *akēō
Latin aceō ‘to be sour’
English acyl
Today it means
noun Any acyl cation R-C⁺=O derived from a carboxylic acid.
Language periods are conventional ranges, not dates for this word.
Etymograph / acylium