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Definition of Orphan drug
1. 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. ¹
2. Noun. (US legal) A drug as defined under the Orphan Drug Act (1983). ¹
¹ Source: wiktionary.com
Medical Definition of Orphan drug
1. A pharmaceutical that has been abandoned or neglected during its development because it is seen as having only a limited potential for profit. Often a drug which only has a limited target population or which treats a rare disease, thus limiting its financial potential. (09 Oct 1997)