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proleg
prolegomenon
prolepsis
proletarian
proletariat
proliferate
proliferous
prolific
proline
prolix
prolocutor
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proline
pro·line [ prṓ ln ]


noun 
Definition:
 
amino acid: an amino acid found in many proteins, particularly in collagen. C5H9NO2
[Early 20th century. Contraction of pyrrolidine-2-carboxylic acid]
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