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.
IMAGINARY a.
-- Imaginary expression or quantity (Alg.), an algebraic expression which involves the impossible operation of taking the square root of a negative quantity; as, sq. root-9, a + b sq. root-1. -- Imaginary points, lines, surfaces, etc. (Geom.), points, lines, surfaces, etc., imagined to exist, although by reason of ce…
IMMUTABLE a.
ble of change; unchangeable; unalterable. That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation. Heb. vi. 18. Immutable, immortal, infinite, Eternal King. Milton. -- Im*mu"ta*ble*ness, n. -- Im*mu"ta*bly, adv.