- The definition of a physicist is a scientist specializing in the relation between energy and matter.
An example of a physicist is Sir Isaac Newton.
physicist definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an expert or specialist in physics
physicist definition by American Heritage Dictionary
A scientist who specializes in physics.