stupefacient

1 of 2

adjective

stu·​pe·​fa·​cient

¦st(y)üpə¦fāshənt

: bringing about a stupor : stupefying

stupefacient

2 of 2

noun

"

plural -s

: something promoting stupefaction : narcotic

Word History

Etymology

Adjective

Latin stupefacient-, stupefaciens, present participle of stupefacere to stupefy

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!