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WordNet (r) 3.0 (2006) (WordNet)

Pb
n 1: a soft heavy toxic malleable metallic element; bluish white
when freshly cut but tarnishes readily to dull grey; "the
children were playing with lead soldiers" [synonym: {lead},
{Pb}, {atomic number 82}]
2: a unit of information equal to 1000 terabits or 10^15 bits
[synonym: {petabit}, {Pbit}, {Pb}]
3: a unit of information equal to 1000 terabytes or 10^15 bytes
[synonym: {petabyte}, {PB}]
4: a unit of information equal to 1024 tebibytes or 2^50 bytes
[synonym: {petabyte}, {pebibyte}, {PB}, {PiB}]