PYROGALLOL Definition Meaning - Merriam-Webster The meaning of PYROGALLOL is 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)
TOPICAL Definition Meaning - Merriam-Webster The meaning of TOPICAL is referring to the topics of the day or place : of local or temporary interest How to use topical in a sentence Did you know?