lathyrism

noun

lath·​y·​rism ˈla-thə-ˌri-zəm How to pronounce lathyrism (audio)
: a neurotoxic disorder chiefly affecting people and domestic animals (such as cows and horses) that is characterized especially by irreversible spastic paralysis of the hind or lower limbs and that results from poisoning by an amino acid found in the seeds of some legumes (genus Lathyrus and especially L. sativus)
lathyritic adjective

Word History

Etymology

probably borrowed from French lathyrisme, from New Latin Lathyrus, genus name (going back to Late Latin, "the legume Lathyrus sativus," borrowed from Greek láthyros, of obscure origin) + French -isme -ism

First Known Use

circa 1888, in the meaning defined above

Time Traveler
The first known use of lathyrism was circa 1888

Browse Nearby Words

Cite this Entry

“Lathyrism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lathyrism. Accessed 9 Nov. 2025.

Medical Definition

lathyrism

noun
lath·​y·​rism ˈlath-ə-ˌriz-əm How to pronounce lathyrism (audio)
: a neurotoxic disorder chiefly affecting people and domestic animals (such as cows and horses) that is characterized especially by irreversible spastic paralysis of the hind or lower limbs and that results from poisoning by an amino acid found in some legumes of the genus Lathyrus (especially L. sativus)
Last Updated: - Definition revised
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