PARAFFIN; PARAFFINE n.
t being acted upon by most of the strong chemical reagents. It was formerly regarded as a definite compound, but is now known to be a complex mixture of several higher hydrocarbons of the methane or marsh-gas series; hence, by extension, any substance, whether solid, liquid, or gaseous, of the same chemical series; thu…
PEOPLE n.
Persons, generally; an indefinite number of men and women; folks; population, or part of population; as, country people; -- sometimes used as an indefinite subject or verb, like on in French, and man in German; as, people in adversity. People were tempted to lend by great premiums. Swift . People have lived twenty-four…
PERIOD n.
d and recurring interval of time; more generally, an interval of time specified or left indefinite; a certain series of years, months, days, or the like; a time; a cycle; an age; an epoch; as, the period of the Roman republic. How by art to make plants more lasting than their ordinary period. Bacon.…
PHOTOTAXIS; PHOTOTAXY n.
as various infusorians, the zoöspores of certain algæ, etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed positive phototaxis; if away from the light, negative phototaxis. --Pho`to*tac"tic (#),…
PHYSICAL a.
dition of a person. -- Physical geography. See under Geography. -- Physical point, an indefinitely small portion of matter; a point conceived as being without extension, yet having physical properties, as weight, inertia, momentum, etc.; a material point. -- Physical signs (Med.), the objective signs of the bodily s…