English

fissure vent

From fissure + vent.

A compound of fissure + vent

Proto-Indo-European *bʰeyd- ‘to split’

…

Latin findō ‘to cleave, split, divide’

Latin fissūra ‘a cleft, chink’

Old French fissure

Middle English fissure ‘fissure, rupture’

Latin ventus

Old French vent

Middle French vent ‘wind’

English vent

Today it means

noun A volcanic vent from which lava flows, with minimal explosive activity; characteristic of shield volcanoes.

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

Etymograph / fissure vent