Medical Definition of formula
1a: a recipe or prescription giving method and proportions of ingredients for the preparation of some material (as a medicine)b: a milk mixture or substitute for feeding an infant typically consisting of prescribed proportions and forms of cow's milk, water, and sugar; also : a batch of this made up at one time to meet an infant's future requirements (as during a 24-hour period)
2: a symbolic expression showing the composition or constitution of a chemical substance and consisting of symbols for the elements present and subscripts to indicate the relative or total number of atoms present in a molecule <the formula for ethyl alcohol is C2H5OH>—see empirical formula, molecular formula, structural formula
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