ergot

noun

er·​got ˈər-gət  -ˌgät 

1

: the black or dark purple sclerotium of fungi (genus Claviceps) that occurs as a club-shaped body replacing the seed of a grass (such as rye)

also : a fungus bearing ergots

2

: a disease of rye and other cereals caused by an ergot fungus

3

a

: the dried sclerotia of an ergot fungus grown on rye and containing several alkaloids (such as ergonovine and ergotamine)

b

: any of such alkaloids used medicinally for their contractile effect on smooth muscle (as of the uterus or blood vessels)

ergotic

(ˌ)ər-ˈgä-tik 

adjective

Examples of ergot in a Sentence

Recent Examples on the Web

Likewise, the ergolines—including the lysergic acid derivatives and ergot alkaloids from which LSD is derived—are to be found only in a small number of species from the morning glory (Convolvulaceae) family and fungi from the ergot (Claviceps) family. —Literary Hub, 16 July 2025

Albert Hofmann, the Swiss chemist who discovered LSD, in 1938, suspected that the recipe included ergot, the fungus on which his discovery was based. —Michael Pollan, New Yorker, 19 May 2025

Until as recently as the 1950s, locals ate loaves contaminated by a rye fungus called ergot, the base ingredient of LSD. —Oscar Holland, CNN, 22 Jan. 2025

Your doc might also recommend ergot derivatives, which bind to serotonin receptors and reduce pain signaling in the brain. —Carolyn L. Todd, SELF, 11 Mar. 2024

Experts in the 1970s to 1990s believed that the erratic behavior was caused by ergot poisoning, which would have come from ingesting bread made from moldy rye. —Kay Johnson, Twin Cities, 6 Mar. 2024

First synthesized by Swiss scientist Albert Hofmann in 1938, LSD is derived from ergot, a fungus that infects grain. —Robert Johnson, Rolling Stone, 28 June 2023

He has been absolutely poisoned by allopathic medicine, and has gangrene in his leg caused by having taken shockingly large doses of rye ergot. —Colin B. Bailey, The New York Review of Books, 17 Nov. 2020

Carolyn Young, an associate professor at Noble Research Institute, has been studying ergot and related fungi for many years. —Troy Farah, Discover Magazine, 16 Oct. 2018

Word History

Etymology

borrowed from French, "spur on a rooster, a similar growth on another bird or mammal, fungal sclerotium resembling a rooster's spur," earlier also argot, going back to Old French argoz (subject case) "spur of a bird or animal," derivative from a Gallo-Romance base *arg- "spine, spiny or thorny plant," probably from a pre-Latin substratal language

Note: For a list and discussion of Romance dialect words based on *arg- see Französisches etymologisches Wörterbuch, vol. 25, pp. 182-88.

First Known Use

1683, in the meaning defined at sense 1

Medical Definition

ergot

noun

er·​got ˈər-gət  -ˌgät 

1

a

: the black or dark purple sclerotium of fungi of the genus Claviceps that occurs as a club-shaped body which replaces the seed of various grasses (as rye)

b

: any fungus of the genus Claviceps

2

: a disease of rye and other cereals caused by fungi of the genus Claviceps and characterized by the presence of ergots in the seed heads compare ergotism

3

a

: the dried sclerotial bodies of an ergot fungus grown on rye and containing several ergot alkaloids

b

: ergot alkaloid

ergotic

(ˌ)ər-ˈgät-ik 

adjective