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formula

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Webster's English Dictionary

formula

n. [L., dim. of forma form, model. SeeForm, n.]1. A prescribed or set form; an established rule; a fixed or conventional method in which anything is to be done, arranged, or said. ()

2. (Eccl.) A written confession of faith; a formal statement of foctrines. ()

3. (Math.) A rule or principle expressed in algebraic language; as, the binominal formula. ()

4. (Med.) A prescription or recipe for the preparation of a medicinal compound. ()

5. (Chem.) A symbolic expression (by means of letters, figures, etc.) of the constituents or constitution of a compound. ()

()

Empirical formula (Chem.), an expression which gives the simple proportion of the constituents; as, the empirical formula of acetic acid is C2H4O2. -- Graphic formula, Rational formula (Chem.), an expression of the constitution, and in a limited sense of the structure, of a compound, by the grouping of its atoms or radicals; as, a rational formula of acetic acid is CH3.(C:O).OH; -- called also structural formula, constitutional formula, etc. See also the formula of Benzene nucleus, under Benzene. -- Molecular formula (Chem.), a formula indicating the supposed molecular constitution of a compound. ()