The story
- Proto-Indo-European · derived from*pleh₂-“flat”
- Latin · derived fromplānus“flat”, “level”
- Late Latin · borrowed fromplānārius“relating to a plane”
- English todayplanular
From Late Latin plānārius (“relating to a plane”), derived from Latin plānus (“flat”, “level”), ultimately from Proto-Indo-European *pleh₂- (“flat”).
Words from the same roots
Etymology from Wiktionary, CC BY-SA 4.0.