am·​y·​loid | \ ˈa-mə-ˌlȯid How to pronounce amyloid (audio) \

Definition of amyloid

: 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

Keep scrolling for more

Other Words from amyloid

amyloid adjective

Examples of amyloid in a Sentence

Recent Examples on the Web Research has shown that your brain undergoes a natural detoxifying process in the wee hours of the night, removing harmful byproducts—like the amyloid plaques that cause Alzheimers—produced during a normal day of neurotransmission. Donavyn Coffey, Popular Science, "How to actually detox," 1 Jan. 2020 Looking to 2020, the scientific community eagerly awaits the FDA’s review of Biogen’s (BIIB) amyloid-attacking drug, aducanumab. Stat Staff, STAT, "What will 2020 bring for medicine and science? We asked 16 leaders for predictions," 30 Dec. 2019 Fillit goes on to say that beta-amyloid is just one part of the equation—and that effective Alzheimer's treatment down the road may mimic the evolution of cancer drugs that use either personalized medicine or combination treatments to fight disease. Sy Mukherjee, Fortune, "The Broader Implications of Biogen’s Divisive Alzheimer’s Drug," 5 Dec. 2019 Tissue from deceased patients with the disorder often features amyloid plaques — abnormal clusters of protein fragments between nerve cells — and twisted spaghetti-like proteins known as tangles., "Could a simple eye exam detect signs of Alzheimer’s disease?," 29 Oct. 2019 The reverse relationship could be true: Buildups of amyloid and tau could contribute to lack of sleep. Katherine Ellen Foley, Quartz, "Too many bad nights of sleep could play a role in developing Alzheimer’s," 29 Oct. 2019 In this regard, the development of biomarkers measured in blood samples, including certain forms of the beta-amyloid and tau proteins, is coming along quickly. Dennis J. Selkoe, STAT, "Biogen’s good news on aducanumab could ‘open the floodgates’ for Alzheimer’s drugs," 23 Oct. 2019 The accumulation of amyloid plaques and tau protein tangles are now understood to be hallmarks of Alzheimer’s. Lauren Caruba,, "After decades of research yield no cure, UTSA opens contest seeking causes of Alzheimer’s disease," 17 Dec. 2019 Researchers are still trying to understand the role of beta-amyloid in Alzheimer’s disease, but are also exploring new potential treatment targets ranging from brain inflammation to the gut microbiome. Maria C. Carrillo, Time, "We Will Find a Breakthrough for Alzheimer's Disease," 24 Oct. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'amyloid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of amyloid

1866, in the meaning defined above

Keep scrolling for more

Learn More about amyloid

Time Traveler for amyloid

Time Traveler

The first known use of amyloid was in 1866

See more words from the same year

Statistics for amyloid

Last Updated

28 Jan 2020

Cite this Entry

“Amyloid.” Dictionary, Merriam-Webster, Accessed 23 Feb. 2020.

Keep scrolling for more

More Definitions for amyloid


am·​y·​loid | \ ˈam-ə-ˌlȯid \

Medical Definition of amyloid

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

Other Words from amyloid

amyloid adjective

More from Merriam-Webster on amyloid Encyclopedia article about amyloid

Comments on amyloid

What made you want to look up amyloid? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

More Confusing Words—Quiz

  • cats on impossible timber
  • The magician ______ moved the selected card to the top of the deck.
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!