Wordnet 3.0
NOUN (1)
1. 
 a unit of information equal to 1024 exbibytes or 2^70 bytes; 
[syn: zettabyte, zebibyte, ZB, ZiB]
WordNet (r) 3.0 (2006):
zebibyte
    n 1: a unit of information equal to 1024 exbibytes or 2^70 bytes
         [syn: zettabyte, zebibyte, ZB, ZiB]