dichotomous key

noun

: a key for the identification of organisms based on a series of choices between alternative characters

Examples of dichotomous key in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The team created a dichotomous key (a series of yes/no questions) to help other researchers consistently identify the cause of a wound. Melissa Cristina Márquez, Forbes.com, 11 June 2025

Word History

First Known Use

circa 1889, in the meaning defined above

Time Traveler
The first known use of dichotomous key was circa 1889

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Cite this Entry

“Dichotomous key.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dichotomous%20key. Accessed 20 Jun. 2025.

Kids Definition

dichotomous key

noun
: a series of pairs of phrases or descriptions which are used to classify a group of living things by making choices between the sets of traits and characters described in each pair

Medical Definition

dichotomous key

noun
: a key for the identification of organisms based on a series of choices between alternative characters
Last Updated: - Updated example sentences
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