SPECTRUM n.
iffraction, as by a grating. -- Gaseous spectrum, the spectrum of an incandesoent gas or vapor, under moderate, or especially under very low, pressure. It is characterized by bright bands or lines. -- Normal spectrum, a representation of a spectrum arranged upon conventional plan adopted as standard, especially a spe…
SPRUCE n.
a. -- Essence of spruce, a thick, dark-colored, bitterish, and acidulous liquid made by evaporating a decoction of the young branches of spruce. -- Hemlock spruce (Bot.), a graceful coniferous tree (Tsuga Canadensis) of North America. Its timber is valuable, and the bark is largely used in tanning leather. -- Spruce…
SUBLIME v.
To pass off in vapor, with immediate condensation; specifically, to evaporate or volatilize from the solid state without apparent melting; -- said of those substances, like arsenic, benzoic acid, etc., which do not exhibit a liquid form on heating, except under increased pressure.