Wordnet 3.0
NOUN (1)
1. 
 a unit of information equal to 1024 tebibytes or 2^50 bytes; 
[syn: petabyte, pebibyte, PB, PiB]
WordNet (r) 3.0 (2006):
pebibyte
    n 1: a unit of information equal to 1024 tebibytes or 2^50 bytes
         [syn: petabyte, pebibyte, PB, PiB]