Definitions for mackerel shark
Random House Webster's College Dictionary
any of several fierce sharks of the family Lamnidae, including the great white shark and the mako.
Origin of mackerel shark:
fierce pelagic and oceanic sharks
Any shark of the order Lamniformes, having two dorsal fins an anal fin, five gill slits and eyes without nictitating membrane
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"mackerel shark." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/mackerel shark>.