concave

It only uses 1.0 gpf, with the help of two strong jets concealed in a concave rim beneath the seat that create a strong swirl during the flush.

From Slate ● Feb. 25, 2025

Mr Wangchuk studied mechanical engineering after a relative noticed his experiments with concave mirrors to brighten dark buildings and cook food.

From BBC ● Oct. 23, 2024

The team synthesized concave, umbrella-like metal complexes that could shield the rotor molecule from unwanted interactions with other molecules in the crystal.

From Science Daily ● Sep. 29, 2023

On the top and bottom of the cylinder, the metal had been pushed up in a concave shape, thrust out from pressure on the inside.

From Los Angeles Times ● Aug. 3, 2023

I erased the section of the nose that was missing and drew a concave line.

From "The Line Tender" by Kate Allen

In the second book of his Dark Star trilogy, James coaxes beauty from dark thoughts, leaving readers with a concaved, mystical and African-inspired world that begins in free-fall.

From Los Angeles Times ● Feb. 15, 2022

Typewriter faces are not flat like printing type, but are concaved to conform to the curve of the printing surface of the roller.

From The Ear in the Wall by Arthur B. (Arthur Benjamin) Reeve

San Francisco’s magnificent municipal building had concaved like an egg shell.

From Complete Story of the San Francisco Horror by Richard Linthicum

One of them ventured the opinion that birds' wings were concaved on the lower side.

From Aeroplanes by James Slough Zerbe

Note that the rear margin of the flukes of this species, unlike that of the humpback whale, is smooth, broad, and concaved distinctly towards a deep fluke notch.

From Whales, Dolphins, and Porpoises of the Western North Atlantic A Guide to Their Identification by David Caldwell

The world below looked like a vast, shallow bowl, the sides concaving upwards around him to the horizon.

From Hoof and Claw by Sir Charles George Douglas Roberts