n. [ F. méthylène, from Gr. &unr_; wine + &unr_; wood; -- a word coined to correspond to the name wood spirit. ] (Chem.) A divalent hydrocarbon radical, -CH2-, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2; -- formerly called also methene. [ 1913 Webster ]

Methylene blue (Chem.), an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; -- called also pure blue. [ 1913 Webster ]

methylenedioxymethamphetamine

n. a drug designed to have the effects of amphetamines but to avoid the drug laws, but now a controlled substance. Called also MDMA.
Syn. -- MDMA, Adam, ecstasy. [ WordNet 1.5 ]

Oxymethylene

n. [ Oxy- (a) + methylene. ] (Chem.) Formic aldehyde, regarded as a methylene derivative. [ 1913 Webster ]

Pentamethylene

n. [ Penta- + methylene. ] (Chem.) A hypothetical hydrocarbon, C5H10, metameric with the amylenes, and the nucleus of a large number of derivatives; -- so named because regarded as composed of five methylene residues. Cf. Trimethylene, and Tetramethylene. [ 1913 Webster ]

Tetramethylene

n. [ Tetra- + methylene. ] (Chem.) (a) A hypothetical hydrocarbon, C4H8, analogous to trimethylene, and regarded as the base of well-known series or derivatives. (b) Sometimes, an isomeric radical used to designate certain compounds which are really related to butylene. [ 1913 Webster ]

Trimethylene

n. (Chem.) A gaseous hydrocarbon, C3H6, isomeric with propylene and obtained from it indirectly. It is the base of a series of compounds analogous to the aromatic hydrocarbons. [ 1913 Webster ]

WordNet (3.0) WordNet (3.0)

methylene blue

(n) a dark green dye used as a stain, an antiseptic, a chemical indicator, and an antidote in cyanide poisoning, Syn. methylthionine chloride

methylene chloride

(n) a nonflammable liquid used as a solvent and paint remover and refrigerant, Syn. dichloromethane

methylenedioxymethamphetamine

(n) a stimulant drug that is chemically related to mescaline and amphetamine and is used illicitly for its euphoric and hallucinogenic effects; it was formerly used in psychotherapy but in 1985 it was declared illegal in the United States, Syn. MDMA, Example:MDMA is often used at parties because it enables partygoers to remain active for long periods of time

methylene group

(n) the bivalent radical CH2 derived from methane, Syn. methylene radical, methylene

pentylenetetrazol

(n) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark, Syn. Metrazol, pentamethylenetetrazol

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甲二醇

[甲二醇, jiǎ èr chún] methylene glycol

美蓝