Here are some Iâve found on the subject of art and art history. â 1  Art is not what you see, but what you make others seeâ -Edgar Degas. â 2 Painting is poetry that is seen rather than felt, and poetry is painting that is felt rather than seenâ â Leonardo Da Vinci.
Other forms of vitamin B 3 include the corresponding amide and nicotinamide (niacinamide), where the carboxyl group has been replaced by a carboxamide group (CONH 2), as well as more complex amides and a variety of esters.
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.