Doppler

American  

[dop-ler] / ˈdɒp lər /

noun

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

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Doppler Scientific  

/ dŏp′lər /

1. 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.

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Example Sentences

See Examples For:

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

Changes in the spacecraft's velocity will appear in the Doppler shift of those radio signals, allowing engineers to quickly determine Psyche's updated speed and trajectory after it departs Mars and continues toward the asteroid belt.

From Science Daily ● May 11, 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

The stars Slipher looked at showed unmistakable signs of a Doppler shift*–the same mechanism behind that distinctive stretched-out yee-yummm sound cars make as they flash past on a racetrack.

From "A Short History of Nearly Everything" by Bill Bryson

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