Formula

(form'-u-lah). A prescribed method. In pharmacy, a list of the names and respective quantities of substances entering into a composition. In chemistry, a method of representing the gravimetric structure of a compound by symbols. F., Constitutional, or Rational, one that indicates only the union of individual atoms, such as are especially characteristic of the compound. F., Empiric. See F., Unitary. F., Graphic. Same as F., Constitutional. F., Rational. Same as F., Constitutional. F., Structural, one that indicates the complete grouping of all of the atoms, representing the whole chemic deportment of a given compound. F., Unitary, or Empiric, one that belongs to an entire series of bodies that are isomeric, yet wholly different, and that affords no hint as to the character of the (for'-mu-la-re). F., National, a collection of widelj and well-known preparations, omitted from the I. S. Pharmacopeia, but collected and published by the American Pharmaceutic A ociation.