Rb

Rb

Symbol, Chemistry.
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R&B

Also, r&b, R and B.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
Rb
 
the chemical symbol for
rubidium

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

Rb
The symbol for the element rubidium.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
Rb  
The symbol for rubidium.
rubidium   (r-bĭd'ē-əm)  Pronunciation Key 
Symbol Rb
A soft, silvery-white metallic element of the alkali group. It ignites spontaneously in air and reacts violently with water. Rubidium is used in photoelectric cells, in making vacuum tubes, and in radiometric dating. Atomic number 37; atomic weight 85.47; melting point 38.89°C; boiling point 688°C; specific gravity (solid) 1.532; valence 1, 2, 3, 4. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang Dictionary

RB

/R-B-L/ Abbreviation: "Realtime Blackhole List". A service that allows people to blacklist sites for emitting spam, and makes the blacklist available in real time to electronic-mail transport programs that know how to use RBL so they can filter out mail from those sites. Drastic (and controversial) but effective. There is an RBL home page (http://maps.vix.com/rbl/usage.html).
American Heritage
Abbreviations & Acronyms
Rb
rubidium
RB
  1. Botswana (international vehicle ID)

  2. reciprocal beneficiary

  3. running back

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

rb

chemical element of Group 1 (also called Group Ia) in the periodic table, the alkali metal group. Rubidium is the second most reactive metal and is very soft, with a silvery-white lustre. A brief treatment of rubidium follows. For full treatment, see alkali metal.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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