orphan drug

noun
  1. Pharmacology. a drug that remains undeveloped or untested or is otherwise neglected because of limited potential for commercial gain.

Origin of orphan drug

First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

orphan drug in Medicine

orphan drug

n.
  1. Any of various drugs or biologicals that may be useful in treating disease but are not considered to be commercially viable.
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