Molecular formula
Formula For"mu*la, n.; pl. E. {Formulas}, L. {Formul[ae]}. [L., dim. of forma form, model. See{Form}, 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. [1913 Webster]

2. (Eccl.) A written confession of faith; a formal statement of foctrines. [1913 Webster]

3. (Math.) A rule or principle expressed in algebraic language; as, the binominal formula. [1913 Webster]

4. (Med.) A prescription or recipe for the preparation of a medicinal compound. [1913 Webster]

5. (Chem.) A symbolic expression (by means of letters, figures, etc.) of the constituents or constitution of a compound. [1913 Webster]

Note: Chemical formul[ae] 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. [1913 Webster]

{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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • molecular formula — mo*lec u*lar form u*la, n. (Chem.) An expression representing the composition of elements in a chemical substance, commonly consisting of a series of letters and numbers comprising the atomic symbols of each element present in a compound followed …   The Collaborative International Dictionary of English

  • molecular formula — n a chemical formula for a compound existing as discrete molecules that gives the total number of atoms of each element in a molecule <the molecular formula for water is H2O> see STRUCTURAL FORMULA compare EMPIRICAL FORMULA * * * a chemical …   Medical dictionary

  • molecular formula — n. a formula which gives the kinds of atoms or radicals and the number of each kind in the molecule of a compound (Ex.: C6H6 for benzene) …   English World dictionary

  • molecular formula — noun A notation indicating the number of atoms of each element present in a compound. The molecular formula for ethane is CH, while the empirical formula is CH …   Wiktionary

  • molecular formula — molekulinė formulė statusas T sritis chemija apibrėžtis Formulė, rodanti junginio molekulę sudarančių kiekvieno elemento atomų skaičių. atitikmenys: angl. molecular formula rus. молекулярная формула …   Chemijos terminų aiškinamasis žodynas

  • molecular formula — noun a chemical formula based on analysis and molecular weight • Hypernyms: ↑formula, ↑chemical formula • Hyponyms: ↑structural formula …   Useful english dictionary

  • molecular formula — Chem. a chemical formula that indicates the kinds of atoms and the number of each kind in a molecule of a compound. Cf. empirical formula, structural formula. [1900 05] * * * …   Universalium

  • molecular formula — noun Date: 1869 a chemical formula that gives the total number of atoms of each element in each molecule of a substance compare structural formula …   New Collegiate Dictionary

  • molecular formula — molec′ular for′mula n. chem. a chemical formula that indicates the kind and number of atoms in a molecule of a compound • Etymology: 1900–05 …   From formal English to slang

  • molecular formula — /məlɛkjələ ˈfɔmjələ/ (say muhlekyuhluh fawmyuhluh) noun the formula of a chemical compound showing the number and kind of atoms present in the molecule, but not their arrangement …   Australian English dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”