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.
Over the past few decades researchers have begun to realize that Alzheimer’s is more than the tangles of tau proteins and clusters of amyloid plaque that are the defining biological signs of the disease. Lauren Gravitz, Scientific American, 16 Sep. 2025 Participants with insomnia who reported sleeping less than usual in those two weeks had more white matter hyperintensities and amyloid plaques than participants with insomnia who noted no such issues. Tom Gavin, EverydayHealth.com, 16 Sep. 2025 The team looked for white matter hyperintensities—areas of brain tissue damage linked to small vessel disease—and amyloid plaques, the protein deposits tied to Alzheimer's disease. Lucy Notarantonio, MSNBC Newsweek, 10 Sep. 2025 The pill, which was tested in some patients at his center, is designed to interrupt the process that leads to amyloid plaques, rather than removing plaques that have already formed. Jon Hamilton, NPR, 2 Sep. 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

Browse Nearby Words

Cite this Entry

“Amyloid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/amyloid. Accessed 23 Sep. 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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