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a discrete particle (quantum) of radiant energy.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
pho·ton (hν, γ),(fō'ton),
In physics, a corpuscle of energy or particle of light; a quantum of light or other electromagnetic radiation.
Farlex Partner Medical Dictionary © Farlex 2012
The elementary particle of light and other electromagnetic radiation; the quantum of electromagnetic energy. The photon is the massless, neutral vector boson that mediates electromagnetic interactions.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
physics A corpuscle of energy or particle of light; a quantum of light or other electromagnetic radiation.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
photona quantum of radiant energy with a wavelength in the visible range of the ELECTROMAGNETIC SPECTRUM.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
A light particle.
Mentioned in: Positron Emission Tomography (PET)
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
The basic unit of radiant energy defined by the equation
E = hνwhere h is Planck's constant (6.62 ✕ 10−34 joule ✕ second), ν the frequency of the light and E the energy difference carried away by the emission of a single photon of light. The term photon usually refers to visible light whereas the term quantum refers to other electromagnetic radiations. See quantum theory; wave theory; troland.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
In physics, corpuscle of energy or particle of light; a quantum of light or other electromagnetic radiation.
Medical Dictionary for the Dental Professions © Farlex 2012