: a very large toothed whale (Physeter macrocephalus synonym P. catodon) that has large conical teeth in the lower jaw, a single blowhole, and a massive squarish head with a closed cavity containing a fluid mixture of spermaceti and oil, and that may reach a length in the male of nearly 60 feet (18.3 meters)

Illustration of sperm whale

Illustration of sperm whale

Examples of sperm whale in a Sentence

Recent Examples on the Web
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When Jay encounters a giant squid being chased by a mammoth sperm whale, he’s unwittingly entangled in the former’s tentacles and swallowed up in one extended, terrifying sequence. — David MacK, CNN Money, 15 Oct. 2026 In bitterness and grief, Jay goes scuba diving to recover his father’s body and gets swallowed by a sperm whale. — Amy Nicholson, Los Angeles Times, 15 Oct. 2026 Anyone who has seen the heart-pounding trailer of Whalefall, which follows a scuba diver being swallowed whole by a giant sperm whale, would probably not see said whale as the film’s hero. — Kirsten Chuba, HollywoodReporter, 14 Oct. 2026 The diver gets swallowed by an 80-foot, 60-ton sperm whale and has only one hour to escape before his oxygen runs out. — Dessi Gomez, Deadline, 10 Sep. 2026 See All Example Sentences for sperm whale

Word History

Etymology

short for spermaceti whale

First Known Use

circa 1700, in the meaning defined above

Time Traveler
The first known use of sperm whale was circa 1700

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Cite this Entry

“Sperm whale.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sperm%20whale. Accessed 17 Oct. 2026.

Kids Definition

sperm whale

noun
: a large toothed whale with a large chamber in the skull that contains a fluid mixture of spermaceti and oil

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