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expert witness

American  

noun

  1. a person, as a physician, who provides testimony at a legal proceeding in the form of professional opinions.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Wise is a paid consultant for Pfizer, Bayer, K36, OncoC4, AstraZeneca, and Janssen Pharmaceuticals, and is an expert witness for Exxon Mobil.

From Science Daily • Feb. 25, 2026

Johnson has been an advocate of Kory’s for years, calling the doctor as an expert witness in two 2020 Senate hearings.

From Salon • Dec. 15, 2025

An expert witness for the bank testified the barrels will be “very, very, very difficult to sell,” Everett said.

From The Wall Street Journal • Oct. 6, 2025

And this could include situations where police cannot find an expert witness or may not be able to obtain a required medical statement.

From BBC • Jun. 6, 2025

At times, too, she was needed as an expert witness for trials.

From "The Woman All Spies Fear" by Amy Butler Greenfield

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.