Definition of "ponderable" [pon•der•a•ble]

• Considerable enough to be weighed or assessed; appreciable: ponderable results; ponderable issues. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "We will return to the propagation of light in ponderable matter."
• "In the older theory of undulation, which considered the ether as an elastic medium, there was already talk of tiny particles contained in ponderable substances which could be set in motion by light vibrations."
• "At the same time, a start was made on a general theory which ascribed all electromagnetic processes taking place in ponderable substances to electrons."