Definition of common dolphin
: either of two dolphins of the genus Delphinus (D. delphis and D. capensis) that are found in temperate and tropical waters and have a brown or black back, a whitish belly, and often an hourglass-shaped pattern on the sides They explain how common dolphins are often found in large numbers and are recognizable by yellowish stripes on their sides above white bellies. — Pete Thomas, The Los Angeles Times, 30 Mar. 2004 A pod of common dolphins celebrated our mid-day departure from Esperance Bay by surfing our bow wave and leaping 3 m into the air. — Howard Whelan, Australian Geographic, July/September 1992
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