[ an-jee-oh-ten-sin ]
/ ˌæn dʒi oʊˈtɛn sɪn /

noun Biochemistry.

any of three oligopeptides occurring in plasma, an inactive form (angiotensin I) and two varieties (angiotensin II and angiotensin III) that elevate blood pressure and stimulate the adrenal cortex to secrete aldosterone.

Origin of angiotensin

1960–65; probably blend of angiotonin + hypertensin, earlier names for the substances Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for angiotensin i

/ (ˌændʒɪəˈtɛnsɪn) /


a peptide of physiological importance that is capable of causing constriction of blood vessels, which raises blood pressure

Word Origin for angiotensin

from angio- + tense 1 + -in
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

Medical definitions for angiotensin i (1 of 2)

angiotensin I


A decapeptide that is the precursor to angiotensin II but is itself physiologically inactive.

Medical definitions for angiotensin i (2 of 2)

[ ăn′jē-ō-tĕnsĭn ]


Any of a group of peptides with vasoconstrictive activity that function physiologically in controlling arterial pressure.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for angiotensin i

[ ăn′jē-ō-tĕnsĭn ]

Any of three polypeptide hormones that function in the body in controlling arterial pressure. The most important is known as angiotensin II, a powerful vasoconstrictor that stimulates steroid production by the adrenal glands, reduces fluid loss from the kidneys, and also functions as a neurotransmitter. Angiotensin II is formed from inactive angiotensin I by the action of angiotensin-converting enzyme (or ACE). See also ACE inhibitor renin.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.