The Collaborative International Dictionary of English v.0.48:

Orca \Or"ca\ ([^o]r"k[.a]), prop. n.
   The killer whale (Orcinus orca).
   [PJC]

WordNet (r) 3.0 (2006):

orca
    n 1: predatory black-and-white toothed whale with large dorsal
         fin; common in cold seas [syn: killer whale, killer,
         orca, grampus, sea wolf, Orcinus orca]

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

ORCA
       Online Resource Control Aid


The Free On-line Dictionary of Computing (30 December 2018):

Orca

   Vrije Universiteit, Amsterdam, 1986.  Similar to Modula-2, but
   with support for distributed programming using shared data
   objects, like Linda.  A 'graph' data type removes the need for
   pointers.  Version for the Amoeba OS, comes with Amoeba.
   "Orca: A Language for Distributed Processing", H.E.  Bal
    et al, SIGPLAN Notices 25(5):17-24 (May 1990).