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

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

Because it uses a gas of atoms, effects such as Doppler broadening, collisional broadening, and averaging across many atoms can blur the signal.

From Science Daily ● Apr. 17, 2026

Bilateral lower extremity venous Doppler ultrasounds were performed and revealed chronic venous insufficiency, a benign and common condition, particularly in individuals over the age of 70.

From Slate ● Jul. 18, 2025

Or the red shift might be a Doppler effect due not to the general expansion of the universe but rather to a more modest and local galactic explosion.

From "Cosmos" by Carl Sagan