pos i'tion f., a, chemical f

showing the reactions occurring in the splitting up of a compound. den'tal f., see under dental, elec'trical f., a graphic representation by means of symbols of the reaction of a muscle to an electrical stimulus, empir'ical f., in chemistry, a. f. indicating the kind and number of atoms in the molecules of a substance, or its composition, but not the relation of the atoms to each other or the intimate structure of the molecule, i.e. its constitution, glyp'tic f. [G. glypios, carved], structural f graph'ic f in chemistry, a f showing the relations of all the atoms, thus indicating fully the constitution of a substance, magistral f. (maj'is-tral), a prescription for preparing an extemporaneous* mixture, molec'ular f., one which indicates definitely the number of atoms of each element composing the molecule, official f. (of-fish'al), a f. contained in the pharmacopeia. ra'tional f., in chemistry, a f. which indicates more or le completely the constitution as well as the composition of a substance, stereo chem'- ical f., structural f. struc'tural f., one in which the relative positions of the atoms and groups of atoms, as well as their kind and number, are indicated; graphic f. typ'ical i., in chemistry, a f. constructed after that of one of the three types, hydrogen, water, and ammonia, and indicating partially the constitution of a substance. ver'tebral f., see under vertebral.