# Doppler

/ˈdɑpɫɝ/ (US) · CEFR C1 · Noun

Source: https://englishreference.com/word/doppler
Updated: 2026-08-15

## Definition

a medical test that uses sound waves to check how blood is moving through your body. It helps doctors see if there are any blocks or problems in your heart or veins.

For teachers: an ultrasound-based diagnostic tool used to measure the velocity and direction of blood flow within the circulatory system. Often functions as a modifier before another noun.

## Examples

- The doctor ordered a doppler to check the blood flow in my legs.
- During the pregnancy check-up, the technician used a doppler to monitor the baby's heartbeat and ensure the umbilical cord was functioning correctly.
- Advanced doppler imaging allows clinicians to non-invasively detect arterial stenosis by calculating the shift in frequency of sound waves reflecting off moving red blood cells.

## Usage notes

- Often used as a noun adjunct in phrases like 'doppler ultrasound' or 'doppler scan'.

---

From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.