English

halfplanar

From half + planar.

A compound of half + planar

Proto-Germanic *halbaz

Proto-West Germanic *halb

Old English healf

Middle English half

English half

Proto-Indo-European *pl̥h₂nós

Proto-Italic *plānos

Latin plānus ‘flat”, “level’

Late Latin plānārius ‘relating to a plane’

Today it means

adj Relating to half-planes.

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

Etymograph / halfplanar