Definition of spiny dogfish
: any of various dogfishes constituting the family Squalidae and distinguished by the presence of a spine in or immediately anterior to each dorsal fin: such as a : a common very destructive dogfish (Squalus acanthias) of both coasts of the North Atlantic that becomes about four feet long and has the fin spines stout and prominent b : a similar dogfish (Squalus suckleyi) of the Pacific coast of North America
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