orphan drug

noun

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

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Origin:
1975–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Orphan drug is always a great word to know.

So is quincunx. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

a chattering or flighty, light-headed person.

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American Heritage

Medical Dictionary

orphan drug or·phan drug (ôr'fən)
n.
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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