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Pb

chemical abbreviation for "lead," from Latin plumbum "lead" (see plumb (n.)).

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Definitions of Pb
1
pb (n.)
a unit of information equal to 1000 terabytes or 10^15 bytes;
Synonyms: petabyte
pb (n.)
a unit of information equal to 1024 tebibytes or 2^50 bytes;
Synonyms: petabyte / pebibyte / PiB
2
Pb (n.)
a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey;
Synonyms: lead / atomic number "
Pb (n.)
a unit of information equal to 1000 terabits or 10^15 bits;
Synonyms: petabit / Pbit
From wordnet.princeton.edu