ˌpərpyərōˈgalə̇n noun
( -s )
Etymology: Latin purpura purple + English -o- + pyro gall ol + -in
: a red crystalline phenolic ketone dye C 11 H 4 O(OH) 4 that occurs naturally in various plant galls as the diglucoside and is made synthetically by oxidation of pyrogallol