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nuclear threshold

noun

the point during a conflict or war at which the use of nuclear weapons is chosen

Dictionary.com's 21st Century Lexicon
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nuclear pore in Medicine

nuclear pore n.
An octagonal opening where the inner and outer membranes of the nuclear envelope are continuous.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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