Doppler

American

[dop-ler] / ˈdɒp lər /

noun

Christian Johann, 1803–53, Austrian physicist: discovered the Doppler effect.

Doppler Scientific

/ dŏp′lər /

Austrian physicist and astronomer who in 1842 explained the effect, now named for him, of variations in the frequency of waves as a result of the relative motion of the wave source with respect to the observer.

Example Sentences

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Doppler

Doctors and nurses with Doppler machines and ultrasounds kept showing up, forcing them to hear the heartbeat and see the movement of a tiny body.

From Salon ● May 27, 2026

A system called Trackman uses in-stadium, two-directional Doppler radar and synchronized high-speed cameras to quantify everything from a ball’s rotation and velocity to location.

From The Wall Street Journal ● Apr. 30, 2026

“At 8:53 a.m. Doppler radar indicated thunderstorms producing heavy rain across the warned area,” an alert warned.

From Los Angeles Times ● Dec. 25, 2025

These motions appear as slight Doppler shifts in the star's light.

From Science Daily ● Nov. 13, 2025

This is the Doppler effect, and it works with light, too.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023