| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| B particle |
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| NOUN: | Either of two subatomic particles in the meson family, one neutral and one positively charged, both of which have masses 10,331 times that of an electron and average lifetimes of 1.6 × 10-12 seconds. See table at subatomic particle.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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