methylene blue

noun

: a basic thiazine dye C₁₆H₁₈ClN₃S·3H₂O used especially as a biological stain, an antidote in cyanide poisoning, and an oxidation-reduction indicator

Examples of methylene blue in a Sentence

Recent Examples on the Web

The antipsychotic drug chlorpromazine, derived from a clothing dye called methylene blue, was first tested on agitated and delusional patients in 1952. — Literary Hub, 28 Apr. 2026

Peptide cocktails, plasma exchange therapy, infrared sauna sessions, and methylene blue drips. — Jen Murphy, Condé Nast Traveler, 6 Aug. 2025

Some supplement sellers may claim that methylene blue products are FDA-approved, but only the methemoglobinemia treatment has been approved. — Stephanie Brown, Verywell Health, 24 July 2025

For these reasons, researchers are studying methylene blue’s effect on the brain. — Lorne J. Hofseth, The Conversation, 3 June 2025

Gynecologists also use methylene blue to check for fallopian tube blockages during laparoscopic surgery. — Tom Gavin, EverydayHealth.com, 12 May 2025

Word History

First Known Use

1882, in the meaning defined above

Rhymes for methylene blue

• hullabaloo
• accrue
• ado
• ainu
• aircrew
• airscrew
• anew
• askew
• baboo
• babu
• bamboo
• beaucoup

Kids Definition

methylene blue

noun

meth·​y·​lene blue

ˌmeth-ə-ˌlēn-

: a dye used as a biological stain and to reverse the effects of cyanide poisoning

Medical Definition

methylene blue

noun

: a basic thiazine dye C₁₆H₁₈ClN₃S·3H₂O used in the treatment of methemoglobinemia, as an antidote in cyanide poisoning, as a biological stain, and as an oxidation-reduction indicator