different between redhair vs erythromycin

English

From (Streptomyces) erythr(eus) +? -o- +? -mycin (“antibiotic from a Streptomyces strain”).

erythromycin (countable and uncountable, plural erythromycins)

(pharmacology) A broad-spectrum macrolide antibiotic C₃₇H₆₇NO₁₃ produced by an actinomycete Saccharopolyspora erythraea (formerly Streptomyces erythreus) and similar in its effects to penicillin, administered orally or topically in the treatment of infections caused by Gram-positive bacteria.

“erythromycin”, in Lexico, Dictionary.com; Oxford University Press, 2019–present.
“erythromycin”, in Merriam–Webster Online Dictionary, (Please provide a date or year).

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