There are 2 definitions of Pb in English:

Pb1

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symbol

The chemical element lead.
[from Latin plumbum]

Definition of Pb in:

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous

There are 2 definitions of Pb in English:

PB2

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abbreviation

1 Computing Petabyte(s).
1.1 (also pb) Paperback: hb £16.99, pb £7.99

noun

informal (also pb) Back to top  
short for personal best. she took another half a second off her PB in the Olympic heats
More example sentences
  • Andrew Baddeley set a PB of 3:43.50 in the 1500m and on a day when the home nation did not extensively cover itself in glory, the GB men's 400m relay squad rounded off the afternoon in style.
  • With a PB score of 4,885 points, he is currently Britain's second ranked junior (U-20) in this event.
  • I've done several PBs and I've got into the Olympic final, so I'm pleased.

Definition of Pb in: