from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Any of a number of
steel tubes, containing boronor other neutron absorber, that is inserted into the coreof a nuclear reactorin order to control its rate of reaction
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a steel or aluminum rod that can be moved up or down to control the rate of the nuclear reaction
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