porpoise

noun

por·poise | \ ˈpȯr-pəs

Definition of porpoise

(Entry 1 of 2)

1 : any of a family (Phocoenidae) of small gregarious toothed whales especially : a blunt-snouted usually dark gray whale (Phocoena phocoena) of the North Atlantic and North Pacific that typically ranges from 5 to 6 feet (1.5 to 1.8 meters) in length

2 : dolphin sense 1a(1) —not used technically

Note: While not closely related, porpoises and dolphins share a physical resemblance that often leads to misidentification. Porpoises typically have flat, spade-shaped teeth, triangular dorsal fins, and shortened beaks with relatively small mouths while dolphins have cone-shaped teeth, curved dorsal fins, and elongated beaks with larger mouths.

porpoise

verb

porpoised; porpoising; porpoises

Definition of porpoise (Entry 2 of 2)

intransitive verb

1 : to leap or plunge like a porpoise penguins … porpoise out of the water— David Lewis

2 : to rise and fall repeatedly

Examples of porpoise in a Sentence

Recent Examples on the Web: Noun

Orcas have the most varied diet of any whale, dolphin or porpoise, and can take on prey of all types, from stingrays to salmon, depending on the type of orca. — Lynda V. Mapes, The Seattle Times, "What you need to know about the critically endangered southern resident killer whales," 25 Sep. 2018 Indeed, there is evidence that many cetaceans—that is, whales, dolphins and porpoises—have strong and complicated family and social ties. — Alison Gopnik, WSJ, "Like Us, Whales May Be Smart Because They’re Social," 16 Aug. 2018 The red tide has made breathing difficult for locals, scared away tourists, and strewn popular beaches with the stinking carcasses of fish, eels, porpoises, turtles, manatees and one 26-foot whale shark. — Kate Furby, The Seattle Times, "Red tide algae’s deadly toll on sea life has triggered a state of emergency in Florida," 14 Aug. 2018 Harbor porpoises, the smallest dolphin species found in New England, usually measure 4.5 feet to 6 feet and weigh less than 200 pounds. — Laney Ruckstuhl, BostonGlobe.com, "Pregnant porpoise dies on Dorchester Bay shore during the last nor’easter," 10 Mar. 2018 A decade of rescue crusades by conservation groups, hard-core eco-activists and the U.S. Navy have failed to prevent the world’s rarest porpoise from becoming fatally entangled in gill nets set for seafood in Mexico’s northern Gulf of California. — Louis Sahagun, latimes.com, "To save the world's rarest marine mammal, conservationists seek ban on Mexican seafood imports," 11 July 2018 At the bridge, watch for basking sharks, porpoises, and dolphins. — Jamie Moore, USA TODAY, "The world’s 10 most amazing suspension bridges," 26 Apr. 2018 The challenge is amplified by the fact that there are so few of the diminutive porpoises left. — CBS News, "Inside the effort to save the world's most endangered marine mammal, the vaquita," 30 June 2018 Lake sturgeon, which also make a spring spawning migration up the Wolf, porpoise near the raft. — Paul A. Smith, Milwaukee Journal Sentinel, "They love fishing, so they set cabins afloat: Wolf River rafts are 'home' to some anglers," 20 June 2018

Recent Examples on the Web: Verb

Calvin stepped up to the glass, watching Fiona porpoise around Hippo Cove with her mother, Bibi. — Mallorie Sullivan, Cincinnati.com, "Like Fiona, he was born prematurely. Their meeting will melt your heart.," 20 Feb. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'porpoise.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.