waterline

noun

wa·​ter·​line ˈwȯ-tər-ˌlīn 

ˈwä-

: a line that marks the level of the surface of water on something: such as

a(1)

: the point on the hull of a ship or boat to which the water rises

(2)

: a line marked on the outside of a ship that corresponds with the water's surface when the ship is afloat on an even keel under specified conditions of loading

b

: shoreline sense 1

Examples of waterline in a Sentence

We repaired the hull below the waterline.

Recent Examples on the Web

All-in-one cleaning, water clarification, and voice control AquaSense X is an all-in-one cleaner across major surfaces, including walls, floors, waterlines, and water surface cleaning. —Ie Creative Studio, Interesting Engineering, 8 Jan. 2026

Women are, once again, drawing thin charcoal lines along their lids and in their waterline. —Kaleigh Werner, Footwear News, 12 Dec. 2025

Urban Decay’s 24/7 Waterline Eye Pencil clings to your waterline through sweat, heat, and long days, thanks to its creamy, quick-drying formula. —Lily Wohlner, Allure, 2 Dec. 2025

A little trick that’s been passed down for years is using a colored eyeliner in your waterline to enhance your eye color. —Jackie Fields, PEOPLE, 26 Nov. 2025

Word History

First Known Use

circa 1625, in the meaning defined above

Phrases Containing waterline

• the waterline

Rhymes for waterline

• acridine
• alkaline
• andesine
• anodyne
• anticline
• arginine
• asinine
• atropine
• benzidine
• borderline
• byzantine
• calamine

Kids Definition

waterline

noun

wa·​ter·​line ˈwȯt-ər-ˌlīn 

ˈwät-

: a line marked on the outside of a ship that matches the surface of the water when the ship floats evenly