pyrogallol

noun
py·ro·gal·lol | \ˌpī-rō-ˈga-ˌlȯl, -ˌlōl;-ˈgȯ- \

Definition of pyrogallol 

: a poisonous bitter crystalline phenol C6H6O3 with weak acid properties that is usually obtained by pyrolysis of gallic acid and used especially as a mild reducing agent (as in photographic developing)

First Known Use of pyrogallol

1868, in the meaning defined above

History and Etymology for pyrogallol

International Scientific Vocabulary pyro- + gallic (acid) + -ol entry 1

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The first known use of pyrogallol was in 1868

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pyrogallol

noun
py·ro·gal·lol | \-ˈgal-ˌȯl, -ˌōl; -ˈgȯ-ˌlȯl, -ˌlōl \

Medical Definition of pyrogallol 

: a poisonous crystalline phenol C6H6O3 formerly used as a topical antimicrobial (as in the treatment of psoriasis)

More from Merriam-Webster on pyrogallol

Britannica.com: Encyclopedia article about pyrogallol

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