What does porpoise mean?
A small toothed whale that is closely related to the dolphin, typically found in temperate and tropical waters. Porpoises are often confused with dolphins, but they have a more robust body and a triangular dorsal fin.
Example
"The porpoise swam quickly through the waves, its dorsal fin slicing through the water."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.