Etymology

mirfentanil

M3I1R1F4E1N1T1A1N1I1L1

Today it means: A fentanyl derivative with strong selectivity for the μ-opioid receptor. Full definition →

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The story

From [Term?] + -fentanil (“opioid receptor agonist, analgesic”).

Etymology from Wiktionary, CC BY-SA 4.0.