Where does “heptavalency” come from?

heptavalency (English) comes from English valency, from Latin Valentia, from Latin -ia, from Latin -ius, from Proto-Italic -jōs, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

heptavalency (English): The condition of being heptavalent

Definitions

  1. The condition of being heptavalent

Ancestry of “heptavalency”, step by step

heptavalency traces back through two separate lines of ancestry.

via English valency

StepLanguageWordMeaning
1EnglishvalencyThe number of edges connected to a vertex in a...
2LatinValentiahealth, vigour, bodily strength
3Latin-iaUsed to form a feminine abstract noun, usually...
4Latin-iusforming adjectives from nouns; nominative neuter...
5Proto-Italic-jōsForms comparative adjectives
6Proto-Indo-European-yósCreates adjectives from noun or verb stems

via English hepta

StepLanguageWordMeaning
1Englishheptaseven
Every word from Proto-Indo-European -yós
heptavalency — Etymology, Origin & Word History | Etymology Explorer