for·mu·la /ˈfɔrmjələ/ 名詞
For·mu·la n.; pl. E. Formulas L. Formulæ
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.
Note: ☞ Chemical formulæ consist of the abbreviations of the names of the elements, with a small figure at the lower right hand, to denote the number of atoms of each element contained.
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.
n 1: a group of symbols that make a mathematical statement [syn:
2: directions for making something [syn: recipe]
3: a conventionalized statement expressing some fundamental
4: a representation of a substance using symbols for its
constituent elements [syn: chemical formula]
5: something regarded as a normative example; "the convention
of not naming the main character"; "violence is the rule
not the exception"; "his formula for impressing visitors"
[syn: convention, normal, pattern, rule]
6: a liquid food for infants
7: (mathematics) a standard procedure for solving a class of
mathematical problems; "he determined the upper bound with
Descartes' rule of signs"; "he gave us a general formula
for attacking polynomials" [syn: rule]
[also: formulae (pl)]