The Collaborative International Dictionary of English v.0.48:

Terek \Ter"ek\, n. [Because found on the Terek River in the
   Caucasus.]
   A sandpiper (Terekia cinerea) of the Old World, breeding in
   the far north of eastern Europe and Asia and migrating to
   South Africa and Australia. It frequents rivers.
   [Webster 1913 Suppl.]