n. 烟碱酸

[ noun ]
a B vitamin essential for the normal function of the nervous system and the gastrointestinal tract
<noun.substance>

niacin \niacin\ n.
A B vitamin (vitamin B5) essential for the normal function of
the nervous system and the gastrointestinal tract. Called
also {nicotinic acid} and {antipellagra vitamin}. Chemical
formula {C6H5NO2}, chemically it is 3-pyridinecarboxylic
acid.

Syn: nicotinic acid.
[WordNet 1.5]


nicotinic acid \nic`o*tin"ic ac"id\, n. (Chem.)
An organic acid ({C6H5NO2}), a carboxylated derivative of
pyridine, obtained by the oxidation of nicotine; called also
{niacin} and {antipellagra vitamin}, and {vitamin B5}.
Chemically it is 3-pyridinecarboxylic acid.

Note: It is a cofactor in several enzymatic reactions, and is
used to prevent a pellagra-like disease in dogs.
--[MI11]

Syn: 3-pyridinecarboxylic acid, niacin, antipellagra vitamin.
[1913 Webster +PJC]