English
subvalent
From sub- + valent.
Proto-Indo-European *upó ‘up; from below’
Proto-Italic *supo ‘under’
Latin sub ‘under, beneath, below’
English sub-
Today it means
adj Exhibiting a valency (oxidation number) that is less than normal
Language periods are conventional ranges, not dates for this word.
Etymograph / subvalent