English

ambilineal

From ambi- + lineal.

Proto-Indo-European *h₂en- ‘on, onto’

Proto-Italic *amβō

Latin ambo ‘both’

English ambi-

Proto-Italic *līnom

…

Latin līneus ‘flaxen’

Latin līnea ‘a line’

Latin līneālis ‘consisting of lines, linear, lineal’

Old French lineal

Today it means

adj Of or pertaining to both sides of a family.

Language periods are conventional ranges, not dates for this word.

Etymograph / ambilineal