English

levorotation

From levo- + rotation.

Proto-Indo-European *leh₂iwos

Latin laevus ‘left’

English levo-

Proto-Indo-European *Hreth₂- ‘to run’

…

Proto-Italic *rotā

Latin rota ‘wheel’

Latin rotō ‘to turn, trend, wheel, roll, swing about,…’

Latin rotātiō

Today it means

noun Rotation in an anticlockwise direction, especially such rotation of the plane of polarized light.

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

Etymograph / levorotation