NAPHTHA n.
us materials and resembling the naphtha from petroleum; as, Boghead naphtha, from Boghead coal (obtained at Boghead, Scotland); crude naphtha, or light oil, from coal tar; wood naphtha, from wood, etc.
OCCLUSION n.
cs), the phenomenon of absorbing gases, as exhibited by platinum, palladium, iron, or charcoal; thus, palladium absorbs, or occludes, nearly a thousand times its own volume of hydrogen, and in this case a chemical compound seems to be formed.
OFF adv.
touch upon puritanism, either off or on. Bp. Sanderson. From off, off from; off. "A live coal...taken with the tongs from off the altar." Is. vi. 6. -- Off and on. (a) Not constantly; not regularly; now and then; occasionally. (b) (Naut.) On different tacks, now toward, and now away from, the land. -- To be off. (a)…
PARAFFIN; PARAFFINE n.
A white waxy substance, resembling spermaceti, tasteless and odorless, and obtained from coal tar, wood tar, petroleum, etc., by distillation. It is used as an illuminant and lubricant. It is very inert, not being acted upon by most of the strong chemical reagents. It was formerly regarded as a definite compound, but i…
PARROT n.
parrakeet. See Parrakeet. -- Night parrot, or Owl parrot. (Zoöl.) See Kakapo. -- Parrot coal, cannel coal; -- so called from the crackling and chattering sound it makes in burning. [Eng. & Scot.] -- Parrot green. (Chem.) See Scheele's green, under Green, n. -- Parrot weed (Bot.), a suffrutescent plant (Bocconia frut…
PERFECT a.
y the dominant. -- Perfect chord (Mus.), a concord or union of sounds which is perfectly coalescent and agreeable to the ear, as the unison, octave, fifth, and fourth; a perfect consonance; a common chord in its original position of keynote, third, fifth, and octave. -- Perfect number (Arith.), a number equal to the…