from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A proteinase of high specificity that is released by the kidney and acts to raise blood pressure by activating angiotensin.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An circulating enzyme released by mammalian kidneys that converts angiotensinogen to angiotensin-I. Because its activity ultimately leads to formation of angiotensin-II and aldosterone, this hormone plays a role in maintaining blood pressure.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a proteolytic enzyme secreted by the kidneys; catalyzes the formation of angiotensin and thus affects blood pressure
Latin rēnēs, kidneys + -in.(American Heritage® Dictionary of the English Language, Fourth Edition)