from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A bivalent organic radical, C6H4, derived from benzene by removal of two hydrogen atoms.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of three isomeric divalent aromatic radicals derived from benzene by removing two hydrogen atoms from the ortho-, meta- or para- positions.
from the GNU version of the Collaborative International Dictionary of English
- n. A hypothetic radical (C6H4) occurring in certain derivatives of benzene.
from The Century Dictionary and Cyclopedia
- n. A bivalent organic radical derived from benzene by the removal of two hydrogen atoms. Its formula is C6H4=.
Sorry, no etymologies found.