O.R.C.

Officers' Reserve Corps.

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orc «awrk», noun.

any one of various marine mammals, such as the grampus or killer whale: »

The haunt of seals, and orcs, and sea-mews' clang (Milton).

Also, ork.

╂[< Latin orca a kind of whale]

ORC (no periods) or O.R.C.,

1. Officers' Reserve Corps.

2. Organized Reserve Corps (of the U.S. Army).