control rod

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control rod

[kən′trōl ‚räd]
(nucleonics)
Any rod used to control the reactivity of a nuclear reactor; may be a fuel rod or part of the moderator; in a thermal reactor, commonly a neutron absorber. Also known as absorbing rod.

control rod

control rod
A push-pull rod for actuating controls from the cockpit. Control rods are used in manually operated flight control systems.
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