Etymograph

English

equivalve

From equi- + valve.

Formed from equi- + valve

Old Latin aiquos

Latin aequus ‘equal’

English equi-

Latin valva ‘double door, valve’

Middle English valve

English valve

Today it means

adj Having valves of the same size (as is normal)

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

Etymograph / equivalve