xylidine

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of six toxic isomeric anilines, C₈H₁₁N, derived from xylene, used chiefly as dye intermediates.
• noun Any of various mixtures of xylidine isomers.

from The Century Dictionary.

• noun Same as xyloidine.
• noun In chem., an amine derivative from the hydrocarbon xylene, itself obtained from coal-tar. The general formula for xylidine is C₆H₃(CH₃)₂NH₂, but there are six isomeric forms, of which two form the greater part of the oily liquid industrially known under this name and used in the manufacture of artificial dyestuffs.

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

• noun (Chem.) Any one of six metameric hydrocarbons, (CH3)2.C6H3.NH2, resembling aniline, and related to xylene. They are liquids, or easily fusible crystalline substances, of which three are derived from metaxylene, two from orthoxylene, and one from paraxylene. They are called the amido xylenes.

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

• noun organic chemistry Any of six isomeric aromatic amines (CH3)2C6H3NH2 derived from the xylenes