petabyte

[pet-uh-bahyt] /ˈpɛt əˌbaɪt/
noun
1.
2 50 bytes, or 1,024 terabytes.
2.
(loosely) 10 15 or a million billion bytes. Symbol: PB.
Origin
peta- + byte
British Dictionary definitions for petabytes

petabyte

/ˈpɛtəˌbaɪt/
noun
1.
(computing) 1015 or 250 bytes
petabytes in Science
petabyte
  (pět'ə-bīt)   

  1. A unit of computer memory or data storage capacity equal to 1,024 terabytes (250 bytes).

  2. One quadrillion bytes. See Note at megabyte.