Definition: oarlock

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Source: WordNet (r) 1.7 

oarlock
     n : a holder attached to the gunwale of a boat that holds the
         oar in place and acts as a fulcrum for rowing [syn: peg,
          pin, thole, tholepin, rowlock]

Source: Webster's Revised Unabridged Dictionary (1913) 

Oarlock \Oar"lock`\ ([=o]r"l[o^]k`), n. (Naut.),
   The notch, fork, or other device on the gunwale of a boat, in
   which the oar rests in rowing. See Rowlock.