methylene (countable and uncountable, plural methylenes)
(organic chemistry) The divalent radical CH2< in which the free valencies are part of single bonds.
(organic chemistry) The same group, present as a repeating unit, in aliphatic compounds with names such as hexamethylenediamine.
(organic chemistry) The unstable carbene CH2
• methene
Source: Wiktionary
Meth"yl*ene, n. Etym: [F. méthylène, from Gr. wood spirit.] (Chem.)
Definition: A 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. Methylene blue (Chem.), an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; -- called also pure blue.
Source: Webster’s Unabridged Dictionary 1913 Edition
17 June 2024
(noun) an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures; “transdermal scopolamine is used to treat motion sickness”; “someone sedated with scopolamine has difficulty lying”
Espresso is both a coffee beverage and a brewing method that originated in Italy. When making an espresso, a small amount of nearly boiling water under pressure forces through finely-ground coffee beans. It has more caffeine per unit volume than most coffee beverages. Its smaller serving size will take three shots to equal a mug of standard brewed coffee.
