planar

The story

1. Proto-Indo-European · derived from*pleh₂-“flat”
2. Latin · derived fromplānus“flat”, “level”
3. Late Latin · borrowed fromplānārius“relating to a plane”
4. English todayplanar

From Late Latin plānārius (“relating to a plane”), derived from Latin plānus (“flat”, “level”), equivalent to plane + -ar, ultimately from Proto-Indo-European *pleh₂- (“flat”).

Words from the same roots