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PB 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}] |
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