Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An electrically neutral meson consisting of a bottom quark and a bottom antiquark and having a mass 18,513 times that of the electron and a mean lifetime of about 1.2 × 10−20 second.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The upsilon particle

Etymologies

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