fissure.

A narrow crack or opening, often extending through rock or another solid surface.

Use it for

Words that belong together

• deep fissure
• rock fissure

On the page

Steam rose from a fissure beside the trail.

Usage notes

Primary category: setting / environment. Forms: Singular fissure; plural fissures. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: setting, description. Commonness: moderately common.