according to an established norm, rule, or principle; conformed to a type, standard, or regular form; performing the proper functions; not abnormal; regular; natural; analogical.-according to a square or rule; perpendicular; forming a right angle. specifically: of or pertaining to a normal.-standard; original; exact; typical.-denoting a solution of such strength that every cubic centimeter contains the same number of milligrams of the element in question as the number of its molecular weight.-denoting certain hypothetical compounds, as acids from which the real acids are obtained by dehydration; thus, normal sulphuric acid and normal nitric acid are respectively s(oh)6, and n(oh)5.-denoting that series of hydrocarbons in which no carbon atom is united with more than two other carbon atoms; as, normal pentane, hexane, etc. cf. iso-.-any perpendicular.-a straight line or plane drawn from any point of a curve or surface so as to be perpendicular to the curve or surface at that point.