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Related to pigeon hawk: Falco columbarius
(Animals) the North American variety of the merlin
a small falcon, Falco columbarius, of the Northern Hemisphere, that feeds largely on birds taken in flight. Also called pigeon hawk.
[1350–1400; Middle English merlioun, merlone < Anglo-French merilun, Old French esmerillon, diminutive of esmeril < Germanic; akin to German Schmerl, Old Norse smyrill]
a magician and seer in Arthurian legend.