Definitions for orphan drug
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Random House Webster's College Dictionary
or′phan drug′(n.)
a drug that remains undeveloped or is neglected because of limited potential for commercial gain.
Category: Pharmacology
Origin of orphan drug:
1975–80
Wiktionary
orphan drug(Noun)
A medicinal drug which is effective in the treatment of some disease(s), but which is not manufactured or marketed because the demand is insufficient to cover the costs of supply.
orphan drug(Noun)
A drug as defined under the Orphan Drug Act (1983).
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"orphan drug." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/orphan drug>.