English

quadriplane

From quadri- + plane

Proto-Indo-European *kʷetwṓr

Proto-Italic *kʷettwōr ‘four’

Latin quattuor ‘four’

Proto-Indo-European *pleh₂- ‘flat’

Proto-Indo-European *pl̥h₂nós

Proto-Italic *plānos

Latin plānus ‘plain’

Latin plānum ‘flat surface’

English plane

Today it means

noun Quadruplane.

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

Etymograph / quadriplane