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
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This ratio is correlated with the presence or absence of amyloid plaques in the brain, potentially reducing the need for more invasive procedures like PET scans or spinal fluid analysis. Mill Etienne, Forbes.com, 25 May 2025 About 92% of those with positive blood test results had confirmed amyloid plaques, while negative results were confirmed in 97% of participants. Jennifer Klump, Verywell Health, 23 May 2025 The results show whether the brain of a person with cognitive symptoms also has amyloid plaques, clumps of toxic proteins that build up in the spaces between brain cells. Jon Hamilton, NPR, 21 May 2025 Researchers found that nearly 92 percent of individuals who tested positive for amyloid plaques with the Lumipulse test also had evidence of amyloid plaques verified by PET scans or spinal taps. Tom Gavin, EverydayHealth.com, 20 May 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 4 Jun. 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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