PENTAD n.
Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad; as, nitrogen is a pentad in the ammonium compounds.
PINEY a.
tree (Vateria Indica) when wounded. It is used as a varnish, in making candles, and as a substitute for incense and for amber. Called also liquid copal, and white dammar. -- Piney tallow, a solid fatty substance, resembling tallow, obtained from the roasted seeds of the Vateria Indica; called also dupada oil. -- Pin…
PLASMA n.
A mixture of starch and glycerin, used as a substitute for ointments. U. S. Disp. Blood plasma (Physiol.), the colorless fluid of the blood, in which the red and white blood corpuscles are suspended. -- Muscle plasma (Physiol.), the fundamental part of muscle fibers, a thick, viscid, albuminous fluid contained within…
POLE n.
called also craig flounder, and pole fluke. -- Pole lathe, a simple form of lathe, or a substitute for a lathe, in which the work is turned by means of a cord passing around it, one end being fastened to the treadle, and the other to an elastic pole above. -- Pole mast (Naut.), a mast formed from a single piece or f…
QUIPU n.
A contrivance employed by the ancient Peruvians, Mexicans, etc., as a substitute for writing and figures, consisting of a main cord, from which hung at certain distances smaller cords of various colors, each having a special meaning, as silver, gold, corn, soldiers. etc. Single, double, and triple knots were tied in th…
RECIPROCAL a.
ath.), one which remains unchanged in form when the reciprocal of the unknown quantity is substituted for that quantity. -- Reciprocal figures (Geom.), two figures of the same kind (as triangles, parallelograms, prisms, etc.), so related that two sides of the one form the extremes of a proportion of which the means ar…