• synonyms


See more synonyms on Thesaurus.com
Symbol, Chemistry.
  1. lead.

Origin of Pb

From the Latin word plumbum


  1. power brakes.


Symbol, Computers.
  1. petabyte.


  1. Baseball. passed ball; passed balls.


  1. British Pharmacopoeia.

Origin of P.B.1

From the Latin word Pharmacopoeia Britannica


  1. Prayer Book.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for pb

Historical Examples

  • Let P (fig. 2) be the particle and PB a normal to the surface.

    Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3


  • Blue and purple unite to form purple-blue (PB), popularly called violet.

    A Color Notation

    Albert H. Munsell

  • Lead is not a compound, but an element whose chemical symbol is Pb, taken from the Latin name for lead.

  • Now, similarly, at pB the sector B has come around and begins to pass behind P.

British Dictionary definitions for pb


the chemical symbol for
  1. lead

Word Origin

from New Latin plumbum


abbreviation for
  1. Pharmacopoeia Britannica
  2. Prayer Book
  3. athletics personal best
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

pb in Medicine


  1. The symbol for the elementlead2

pb in Science


  1. The symbol for lead.


  1. A soft, ductile, heavy, bluish-gray metallic element that is extracted chiefly from galena. It is very durable and resistant to corrosion and is a poor conductor of electricity. Lead is used to make radiation shielding and containers for corrosive substances. It was once commonly used in pipes, solder, roofing, paint, and antiknock compounds in gasoline, but its use in these products has been curtailed because of its toxicity. Atomic number 82; atomic weight 207.2; melting point 327.5°C; boiling point 1,744°C; specific gravity 11.35; valence 2, 4. See Periodic Table. See Note at element.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.