English

hemisection

From hemi- + section.

Proto-Indo-European *sem- ‘one, whole’

Proto-Indo-European *sēmi ‘half’

English hemi-

Proto-Indo-European *sek- ‘to cut’

…

Latin sectus ‘cut’

Latin sectiō ‘cutting’

Old French section

Middle English seccioun

Today it means

noun A division along the mesial plane or median plane.

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

Etymograph / hemisection