The Collaborative International Dictionary of English v.0.48:

Roc \Roc\, n. [Ar. & Per. rokh or rukh. Cf. Rook a castle.]
   A monstrous bird of Arabian mythology. [Written also rock,
   and rukh.] --Brande & C.
   [1913 Webster]

WordNet (r) 3.0 (2006):

roc
    n 1: mythical bird of prey having enormous size and strength

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

ROC
       Reconstruction Of Color (ICE, Scanner)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

ROC
       RAID On a Chip (RAID)