Definition of "circuit board" []

• Computer Science An insulated board on which interconnected circuits and components such as microchips are mounted or etched. (noun)

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.

• "A few months later a forty-five-cent circuit board in the military computer alert system signaled that the Soviet Union had just launched a missile attack."