sibling species

noun

: one of two or more species that are nearly indistinguishable morphologically

Word History

First Known Use

1940, in the meaning defined above

Time Traveler
The first known use of sibling species was in 1940

Rhymes for sibling species

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Browse Nearby Words

sibling rivalry
sibling species
sibmate
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Cite this Entry

“Sibling species.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sibling%20species. Accessed 3 Jul. 2026.

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More from Merriam-Webster on sibling species

Britannica.com: Encyclopedia article about sibling species

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