PLOW; PLOUGH n. 2 definitions
A well-known implement, drawn by horses, mules, oxen, or other power, for turning up the soil to prepare it for bearing crops; also used to furrow or break up the soil for other purposes; as, the subsoil plow; the draining plow. Where fern succeeds ungrateful to the plow. Dryden.
POLAR a.
s that are developed and act in pairs, with opposite tendencies or properties in the two elements, as magnetism, electricity, etc. -- Polar hare (Zoöl.), a large hare of Arctic America (Lepus arcticus), which turns pure white in winter. It is probably a variety of the common European hare (L. timidus). -- Polar light…
POLYMERIC a.
Having the same percentage composition (that is, having the same elements united in the same proportion by weight), but different molecular weights; -- often used with with; thus, cyanic acid (CNOH), fulminic acid (C2N2O2H2), and cyanuric acid (C3N3O3H3), are polymeric with each other.
POTASSIUM n.
An Alkali element, occurring abundantly but always combined, as in the chloride, sulphate, carbonate, or silicate, in the minerals sylvite, kainite, orthoclase, muscovite, etc. Atomic weight 39.0. Symbol K (Kalium).