Learn how to say Porpoise correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word porpoise:
a small toothed whale with a low triangular dorsal fin and a blunt rounded snout.
Family Phocoenidae: three genera and several species, in particular the common (or harbour) porpoise (Phocoena phocoena), of the North Atlantic and North Pacific
move through the water like a porpoise, alternately rising above it and submerging:
the boat began to porpoise badly
Middle English: from Old French porpois, based on Latin porcus ‘pig’ + piscis ‘fish’, rendering earlier porcus marinus ‘sea hog’