Definition of kestrel
: any of various small chiefly Old World falcons (genus Falco) that usually hover in the air while searching for prey: as a : a common Eurasian falcon (F. tinnunculus) b : an American falcon (F. sparverius) having a reddish-brown back and tail and bluish-gray wings
Origin of kestrel
Middle English castrel, from Middle French crecerelle, from crecelle rattle; from its cry
First Known Use: 15th century
Learn More about kestrel
Britannica.com: Encyclopedia article about "kestrel"
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