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[proh-leen, -lin] /ˈproʊ lin, -lɪn/
noun, Biochemistry
an alcohol-soluble amino acid, C 4 H 9 NHCOOH, occurring in high concentration in collagen. Symbol: P.
Abbreviation: Pro;
Origin of proline
1900-05; alteration of pyrrolidine Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for proline
  • Casein consists of a fairly high number of proline peptides, which do not interact.
  • Hydroxylation of lysine and proline amino acids occurs inside the lumen.
British Dictionary definitions for proline


/ˈprəʊliːn; -lɪn/
a nonessential amino acid that occurs in protein
Word Origin
C20: from pyrrolidine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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proline in Medicine

proline pro·line (prō'lēn')
Abbr. Pro
An amino acid that is found in most proteins and is a major constituent of collagen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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proline in Science
A nonessential amino acid. Chemical formula: C5H9NO2. See more at amino acid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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