[ proh-leen, -lin ]
/ ˈproʊ lin, -lɪn /

noun Biochemistry.

an alcohol-soluble amino acid, C4H9NHCOOH, occurring in high concentration in collagen. Abbreviation: Pro; Symbol: P

Origin of proline

First recorded in 1900–05; alteration of pyrrolidine Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for proline


/ (ˈprəʊliːn, -lɪn) /


a nonessential amino acid that occurs in protein

Word Origin for proline

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

Medicine definitions for proline


[ prōlēn′ ]


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.

Science definitions for proline


[ prōlēn′ ]

A nonessential amino acid. Chemical formula: C5H9NO2. See more at amino acid.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.