Doppler

American  

[dop-ler] / ˈdɒp lər /

noun

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

---

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.

---

Example Sentences

"But young stars are so extremely spotty, active, and temperamental, that the Doppler method is a non-starter."

From Science Daily • Jan. 31, 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

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

Lines in the spectrum regularly shifted back and forth, suggesting the star was being tugged by an orbiting companion, Doppler shifting the light.

From Science Magazine • Dec. 3, 2024

There is nevertheless a nagging suspicion among some astronomers that all may not be right with the deduction, from the red shifts of galaxies via the Doppler effect, that the universe is expanding.

From "Cosmos" by Carl Sagan