suprachiasmatic nucleus

noun

su·​pra·​chi·​as·​mat·​ic nucleus ˌsü-prə-ˌkī-əz-ˈma-tik- How to pronounce suprachiasmatic nucleus (audio)
: either of a pair of neuron clusters in the hypothalamus situated directly above the optic chiasma that receive photic input from the retina via the optic nerve and that regulate the body's circadian rhythms

Examples of suprachiasmatic nucleus 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.
Our circadian rhythms, 24-hour cycles governed by the brain’s suprachiasmatic nucleus, regulate everything from body temperature to hormone release. — Ximena Araya-Fischel, Forbes.com, 12 Apr. 2025 Melatonin from supplements targets the suprachiasmatic nucleus (SCN) of the hypothalamus in your brain to promote sleep. — Elizabeth Barnes, Verywell Health, 19 Mar. 2025

Word History

First Known Use

1938, in the meaning defined above

Time Traveler
The first known use of suprachiasmatic nucleus was in 1938

Rhymes for suprachiasmatic nucleus

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supracervical
suprachiasmatic nucleus
suprachoroid
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Cite this Entry

“Suprachiasmatic nucleus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/suprachiasmatic%20nucleus. Accessed 21 Apr. 2025.

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Medical Definition

suprachiasmatic nucleus

noun
: either of a pair of neuron clusters in the hypothalamus situated directly above the optic chiasma that receive photic input from the retina via the optic nerve and that regulate the body's circadian rhythms
—abbreviation SCN
Last Updated: - Updated example sentences
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