The story
From ? + -mycin.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A nucleoside-type antibiotic, 4-aminopyrrolo[2,3-d]pyrimidine-5-carbonitrile 7-(β-D-ribofuranoside), analogue of adenosine, isolated from a species of Streptomyces Full definition →
From ? + -mycin.
Etymology from Wiktionary, CC BY-SA 4.0.