dehydro-

a combining form meaning “dehydrogenated,” used in the formation of compound words:

dehydrochlorinate.

Related Word

dehydrochlorinate

dehydro- before a vowel also dehydr-. Chem.|diːˈhaɪdrəʊ|A prefix used in forming the names of some organic compounds, denoting (a) the loss of one atom of hydrogen (or freq. two), (b) the loss of a molecule of water (= anhydro-); as dehydrotriacetonamine; deˌhydroaˈscorbic acid, an oxidation product, C₆H₆O₆, of ascorbic acid; deˌhydrochoˈlesterol [ad. G. dehydro-cholesteryl (A. Windaus et al. 1935, in Ann. Chem. DXX. 106)], the provitamin, C₂₇H₄₄O, of vitamin D₃, naturally formed in human and animal skin under the influence of sunlight.1877H. Watts Fownes' Man. Chem. (ed. 12) II. 264 Triacetonamine, C₉H₁₇NO...Dehydrotriacetonamine, C₉H₁₅N.1933Nature 3 June 800/2 We found that by the action of a copper acetate solution upon ascorbic acid, a dehydroascorbic acid is formed.1935Chem. Abstr. XXIX. 7995 (title) 7-Dehydrocholesterol.Ibid., 7-Hydrocholesterol..with BzCl in C₅H₅N gives a dibenzoate... Heating..gives 58% of the benzoate..of 7-dehydrocholesterol.1946Nature 3 Aug. 169/1 The preparation from cholesterol (I) of 7-dehydrocholesterol (III), which on irradiation gave a highly antirachitic product (vitamin D₃).1959New Biol. XXIX. 35 Dehydroascorbic acid, the oxidized form of vitamin C, is reported as having been obtained..from seawater.1962H. Heath in A. Pirie Lens Metabolism Rel. Cataract 365 Present evidence would seem to indicate that it [sc. ascorbic acid] is actively secreted [by the ciliary body] in the nonionized, oxidized form, dehydroascorbic acid.1965Nomencl. Org. Chem. (I.U.P.A.C.) C. 42 Loss of two hydrogen atoms from a compound designated by a trivial name is denoted by a prefix ‘didehydro-’... In common usage ‘dehydro-’ is often used in place of ‘didehydro-’. For example the above compound [sc. 7, 8-didehydrocholesterol] is often termed dehydrocholesterol.1968R. S. Cahn Introd. Chem. Nomencl. (ed. 3) iii. 44 Removal of atoms is indicated in a few cases, e.g., dehydro (loss of 2H), anhydro (loss of H₂O).

dehydro- /di:ˈhʌɪdrəʊ/ combining form. Before a vowel also dehydr-.

ORIGIN: from de- 3 + hydro-.

Used in Chemistry with the senses ‘that has lost hydrogen’, ‘that has lost (the elements of) water’.

DERIVATIVE dehydroaˈcetic, dehydracetic adjective: dehydroacetic acid, dehydracetic acid, a crystalline cyclic compound, C₈H₈O₄, obtained esp. by heating ethyl acetoacetate L19.
dehydroaˈscorbic adjective: dehydroascorbic acid, a metabolic oxidation product, C₆H₆O₆, of ascorbic acid M20.
dehydrochoˈlesterol noun a provitamin, C₂₇H₄₄O, which on ultraviolet irradiation (in skin tissue) is converted to vitamin D₃ M20.

dehydro-
combining form
see dehydr-

dehydro-

Prefix

organic chemistry Used to form the names of compounds that have lost one or more hydrogen atoms, especially those that have lost even numbers of hydrogen atoms to form double bonds

Derived terms

dehydroamino

dehydroasclepin

dehydrocalactin

dehydrocalotoxin

dehydrocalotropin

dehydrocorydalmine

dehydrouscharidin

词汇	dehydro-
词根词缀	Dictionary.com OED SOED Webster Wiktionary dehydro- 1 a combining form meaning “dehydrogenated,” used in the formation of compound words: dehydrochlorinate. Related Word dehydrochlorinate dehydro- before a vowel also dehydr-. Chem.\|diːˈhaɪdrəʊ\|A prefix used in forming the names of some organic compounds, denoting (a) the loss of one atom of hydrogen (or freq. two), (b) the loss of a molecule of water (= anhydro-); as dehydrotriacetonamine; deˌhydroaˈscorbic acid, an oxidation product, C₆H₆O₆, of ascorbic acid; deˌhydrochoˈlesterol [ad. G. dehydro-cholesteryl (A. Windaus et al. 1935, in Ann. Chem. DXX. 106)], the provitamin, C₂₇H₄₄O, of vitamin D₃, naturally formed in human and animal skin under the influence of sunlight.1877H. Watts Fownes' Man. Chem. (ed. 12) II. 264 Triacetonamine, C₉H₁₇NO...Dehydrotriacetonamine, C₉H₁₅N.1933Nature 3 June 800/2 We found that by the action of a copper acetate solution upon ascorbic acid, a dehydroascorbic acid is formed.1935Chem. Abstr. XXIX. 7995 (title) 7-Dehydrocholesterol.Ibid., 7-Hydrocholesterol..with BzCl in C₅H₅N gives a dibenzoate... Heating..gives 58% of the benzoate..of 7-dehydrocholesterol.1946Nature 3 Aug. 169/1 The preparation from cholesterol (I) of 7-dehydrocholesterol (III), which on irradiation gave a highly antirachitic product (vitamin D₃).1959New Biol. XXIX. 35 Dehydroascorbic acid, the oxidized form of vitamin C, is reported as having been obtained..from seawater.1962H. Heath in A. Pirie Lens Metabolism Rel. Cataract 365 Present evidence would seem to indicate that it [sc. ascorbic acid] is actively secreted [by the ciliary body] in the nonionized, oxidized form, dehydroascorbic acid.1965Nomencl. Org. Chem. (I.U.P.A.C.) C. 42 Loss of two hydrogen atoms from a compound designated by a trivial name is denoted by a prefix ‘didehydro-’... In common usage ‘dehydro-’ is often used in place of ‘didehydro-’. For example the above compound [sc. 7, 8-didehydrocholesterol] is often termed dehydrocholesterol.1968R. S. Cahn Introd. Chem. Nomencl. (ed. 3) iii. 44 Removal of atoms is indicated in a few cases, e.g., dehydro (loss of 2H), anhydro (loss of H₂O). dehydro- /di:ˈhʌɪdrəʊ/ combining form. Before a vowel also dehydr-. ORIGIN: from de- 3 + hydro-. Used in Chemistry with the senses ‘that has lost hydrogen’, ‘that has lost (the elements of) water’. DERIVATIVE dehydroaˈcetic, dehydracetic adjective: dehydroacetic acid, dehydracetic acid, a crystalline cyclic compound, C₈H₈O₄, obtained esp. by heating ethyl acetoacetate L19. dehydroaˈscorbic adjective: dehydroascorbic acid, a metabolic oxidation product, C₆H₆O₆, of ascorbic acid M20. dehydrochoˈlesterol noun a provitamin, C₂₇H₄₄O, which on ultraviolet irradiation (in skin tissue) is converted to vitamin D₃ M20. dehydro- combining form see dehydr- dehydro- Prefix organic chemistry Used to form the names of compounds that have lost one or more hydrogen atoms, especially those that have lost even numbers of hydrogen atoms to form double bonds Derived terms dehydroamino dehydroasclepin dehydrocalactin dehydrocalotoxin dehydrocalotropin dehydrocorydalmine dehydrouscharidin
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