waterline.

The line where a water surface meets a hull, shore, or other object.

Use it for

Words that belong together

• ship's waterline
• below the waterline

On the page

Rust streaked the hull above the waterline.

Usage notes

Primary category: setting / environment. Forms: Singular waterline; plural waterlines. 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. Commonness: moderately common.