HARD a.
as distinguished from paper money. -- Hard oyster (Zoöl.), the northern native oyster. [Local, U. S.] - - Hard pan, the hard stratum of earth lying beneath the soil; hence, figuratively, the firm, substantial, fundamental part or quality of anything; as, the hard pan of character, of a matter in dispute, etc. See Pan.…
HECDECANE n.
A white, semisolid, spermaceti-like hydrocarbon, C16H34, of the paraffin series, found dissolved as an important ingredient of kerosene, and so called because each molecule has sixteen atoms of carbon; -- called also hexadecane.
HEPTANE n.
Any one of several isometric hydrocarbons, C7H16, of the paraffin series (nine are possible, four are known); -- so called because the molecule has seven carbon atoms. Specifically, a colorless liquid, found as a constituent of petroleum, in the tar oil of cannel coal, etc.
HETEROGENEOUS a.
ral numbers; as, hic locus, of the masculine gender in the singular, and hi loci and hæc loca, both masculine and neuter in the plural; hoc cælum, neuter in the singular; hi cæli, masculine in the plural. -- Heterogeneous quantities (Math.), such quantities as are incapable of being compared together in respect to mag…