orphan drug
noun
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
Words nearby orphan drug
orotund,
oroya fever,
orozco,
orpen,
orphan,
orphan drug,
orphan virus,
orphanage,
orphans' court,
orpharion,
orphean
Medical definitions for orphan drug
orphan drug
n.
Any of various drugs or biologicals that may be useful in treating disease but are not considered to be commercially viable.