deu·​tero·​stome ˈdü-tə-rō-ˌstōm How to pronounce deuterostome (audio)
 also  ˈdyü-
: any of a major division (Deuterostomia) of the animal kingdom that includes the bilaterally symmetrical animals (such as the chordates) with indeterminate cleavage and a mouth that does not arise from the blastopore

Examples of deuterostome in a Sentence

Recent Examples on the Web This pristine level of preservation shows that the structures that once looked like pits were actually the bases of spines that broke away in the process of fossilization, suggesting that Saccorhytus wasn’t a deuterostome but something else entirely. Sam Walters, Discover Magazine, 17 Aug. 2022 The team classifies Saccorhytus as a deuterostome, one of the major groups of animals and the branch of the Tree of Life that includes vertebrates. Gemma Tarlach, Discover Magazine, 30 Jan. 2017

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

Word History


New Latin Deuterostomia, group name, from deuter- + Greek stoma mouth — more at stomach entry 1

First Known Use

1950, in the meaning defined above

Time Traveler
The first known use of deuterostome was in 1950

Dictionary Entries Near deuterostome

Cite this Entry

“Deuterostome.” Dictionary, Merriam-Webster, Accessed 28 May. 2024.

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