MERCAPTAN n.
Any one of series of compounds, hydrosulphides of alcohol radicals, in composition resembling the alcohols, but containing sulphur in place of oxygen, and hence called also the sulphur alcohols. In general, they are colorless liquids having a strong, repulsive, garlic odor. The name is specifically applied to ethyl mer…
METAMORPHOSIS n.
to a blossom. Especially, that form of sexual reproduction in which an embryo undergoes a series of marked changes of external form, as the chrysalis stage, pupa stage, etc., in insects. In these intermediate stages sexual reproduction is usually impossible, but they ultimately pass into final and sexually developed fo…
METHANE n.
less, gaseous, inflammable hydrocarbon, CH4; marsh gas. See Marsh gas, under Gas. Methane series (Chem.), a series of saturated hydrocarbons, of which methane is the first member and type, and (because of their general chemical inertness and indifference) called also the paraffin (little affinity) series. The lightest…
MIDDLE n.
f a line, a surface, or a solid; an intervening point or part in space, time, or order of series; the midst; central portion; specif., the waist. Chaucer. "The middle of the land." Judg. ix. 37. In this, as in most questions of state, there is a middle. Burke.