amyloid

noun

am·​y·​loid ˈa-mə-ˌlȯid How to pronounce amyloid (audio)
: a waxy translucent substance consisting primarily of protein that is deposited in some animal organs and tissues under abnormal conditions (such as Alzheimer's disease) compare beta-amyloid
amyloid adjective

Examples of amyloid 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.
Beta amyloid plaques are known to collect between neurons in the brain and disrupt cell function. Jade Walker, CNN, 20 Mar. 2025 Melatonin, for example, is known to increase REM sleep—and has been linked, in mice models, to a reduction in harmful amyloid and tau aggregation. Barbara A. Perry, Newsweek, 27 Jan. 2025 The biological cause of AD is linked to the accumulation of amyloid plaques, tau tangles, and synaptic loss in brain regions such as the hippocampus and cortex, which are critical for higher cognitive functions like memory retrieval. Jenny Lehmann, Discover Magazine, 12 Mar. 2025 But the results of this study pose the question as to whether chronic inflammation is a more important factor in the onset of dementia than amyloid plaque accumulation. New Atlas, 9 Mar. 2025 See All Example Sentences for amyloid

Word History

First Known Use

1866, in the meaning defined above

Time Traveler
The first known use of amyloid was in 1866

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Cite this Entry

“Amyloid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/amyloid. Accessed 1 Apr. 2025.

Medical Definition

amyloid

noun
am·​y·​loid
ˈam-ə-ˌlȯid
1
: a nonnitrogenous starchy food
2
: a waxy translucent substance consisting primarily of protein that is deposited in some animal organs and tissue under abnormal conditions (as in Alzheimer's disease) see beta-amyloid
amyloid adjective

More from Merriam-Webster on amyloid

Last Updated: - Updated example sentences
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