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Definition of Phenacetolin
1. Noun. (chemistry dated) A yellowish-brown powder obtained by the action of sulphuric acid on glacial acetic acid and phenol. ¹
¹ Source: wiktionary.com
Medical Definition of Phenacetolin
1. A red powder, (C16H12)2; used as an indicator. It has a pH range of 5 to 6; being yellow at 5 and red at 6. (05 Mar 2000)