Hyponyms (each of the following is a kind of lacrimator): chlorobenzylidenemalononitrile; CS gas (a tear gas that is stronger than CN gas but wears off faster; can be deployed by grenades or cluster bombs; can cause skin burns and fatal pulmonary edema)
Freebase(0.00 / 0 votes)Rate this definition: Renin. Renin, also known as an angiotensinogenase, is an enzyme that participates in the body's renin-angiotensin system âalso known as the renin-angiotensin-aldosterone axisâthat mediates extracellular volume, and arterial vasoconstriction.
Full Definition of NIACIN. : an acid C6H5NO2 of the vitamin B complex found widely in animals and plants and used especially against pellagra; also: nicotinamide âcalled also nicotinic acid. See niacin defined for English-language learners. See niacin defined for kids.ull Definition of NIACIN. : an acid C6H5NO2 of the vitamin B complex found widely in animals and plants and used especially against pellagra; also: nicotinamide âcalled also nicotinic acid. See niacin defined for English-language learners. See niacin defined for kids.