acorn worm


: any of a class (Enteropneusta) of burrowing wormlike marine animals having an acorn-shaped proboscis and classified with the hemichordates

Examples of acorn worm in a Sentence

Recent Examples on the Web The census turned up more than 6,000 new species candidates, including the pair depicted here: an acorn worm from the deeps of the North Atlantic, and a polychaete worm (right) found on a whale carcass near Japan. Valerie Ross, Discover Magazine, 15 Dec. 2010 An enteropneust, or acorn worm, in the process of leaving behind its characteristic fecal coil on the bottom of the ocean in the Sirena Canyon. Carl Engelking, Discover Magazine, 18 May 2016 This is an acorn worm, a scavenger of seafloor sediment that the researchers found in the North Atlantic. Discover Magazine, 7 July 2010 This larva belongs to tornaria, a kind of acorn worm that likes to live in plankton. Andrew Moseman, Discover Magazine, 20 Apr. 2010

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'acorn worm.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

circa 1889, in the meaning defined above

Time Traveler
The first known use of acorn worm was circa 1889

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Cite this Entry

“Acorn worm.” Dictionary, Merriam-Webster, Accessed 21 May. 2024.

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