Chemistry. any of a group of astringent vegetable principles or compounds, chiefly complex glucosides of catechol and pyrogallol, as the reddish compound that gives the tanning properties to oak bark or the whitish compound that occurs in large quantities in nutgalls (common tannin, tannic acid)
any of these compounds occurring in wine and imparting an astringent taste, especially in red wine.
any of a class of yellowish or brownish solid compounds found in many plants and used as tanning agents, mordants, medical astringents, etc. Tannins are derivatives of gallic acid with the approximate formula C76H52O46 Also called tannic acid
Any of various compounds, including tannic acid, that occur naturally in the bark and fruit of various plants, especially the nutgalls, certain oaks, and sumac. Tannins are polyphenols, and form yellowish to light brown amorphous masses that can be powdery, flaky, or spongy. They are used in photography, dyeing, in tanning leather, in clarifying wine and beer, and as an astringent in medicine. Tannins are also an important ingredient in tea.
noun 1. the process or art of converting hides or skins into leather. 2. a browning or darkening of the skin, as by exposure to the sun. 3. Informal. a thrashing; whipping. verb (used with object), tanned, tanning. 1. to convert (a hide) into leather, especially by soaking or steeping in a bath prepared from […]
noun 1. a boxlike bed having a hinged cover and equipped with sunlamps to produce a suntan.
adjective 1. somewhat tan: a tannish belt.
noun 1. trademark a sound-amplifying apparatus used as a public-address system esp in a large building, such as a university