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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

Baccarelli has served as an expert witness in litigation against Tylenol’s maker.

From The Wall Street Journal • Sep. 22, 2025

He was even called as an expert witness in French courts when there were doubts about an item's authenticity.

From BBC • Jun. 7, 2025

Her testimony was exposed as unreliable by the State's own expert witness, Dr. Dennis McNally, an obstetrician/gynecologist who examined Mrs. Colbey two weeks after the stillbirth.

From "Just Mercy" by Bryan Stevenson

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.