Noun has 4 senses

• pb(n = noun.substance) atomic number 82, lead - 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"




• pb(n = noun.quantity) pbit, petabit - a unit of information equal to 1000 terabits or 10^15 bits;




• pb(n = noun.quantity) petabyte - a unit of information equal to 1000 terabytes or 10^15 bytes;




• pb(n = noun.quantity) pebibyte, petabyte, pib - a unit of information equal to 1024 tebibytes or 2^50 bytes;