from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A bivalent hydrocarbon radical, CH2-, a component of unsaturated hydrocarbons.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The divalent radical CH2< in which the free valencies are part of single bonds.
- n. The same group, present as a repeating unit, in aliphatic compounds with names such as hexamethylenediamine.
- n. The unstable carbene CH2:
from the GNU version of the Collaborative International Dictionary of English
- n. A divalent hydrocarbon radical, -CH2-, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; ; -- formerly called also methene.
from The Century Dictionary and Cyclopedia
- n. A bivalent hydrocarbon radical (CH2) which does not exist free, but occurs in many compounds, as methylene iodide, CH2I2. Also called methene.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the bivalent radical CH2 derived from methane
French méthylène : Greek methu, wine; see medhu- in Indo-European roots + Greek hūlē, wood, substance.(American Heritage® Dictionary of the English Language, Fourth Edition)
French méthylène, from Ancient Greek μέθυ (methy, "wine") + ὕλη (hylē, "wood"). (Wiktionary)