crocein

from The Century Dictionary.

• noun A name given to several acid coal-tar colors on account of the bright red they produce.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A name given to any one of several yellow or scarlet dyestuffs of artificial production and complex structure. In general they are diazo and sulphonic acid derivatives of benzene and naphthol.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry Any of several synthetic yellow or scarlet dyestuffs that are diazo and sulphonic acid derivatives of benzene and naphthol.