dehydro-comb. form

Stress is usually determined by a subsequent element and vowels may be reduced accordingly. Some degree of stress is usually maintained on the second syllable. If the subsequent element is an existing word, it is likely to retain its original stress pattern, e.g. dehydroascorbic acid n. Brit.

/diːˌhʌɪdrəʊəskɔːbɪk ˈasɪd/, U.S.

/diˈˌhaɪdroʊəˌskɔrbɪk ˈæsəd/.

Forms: before a vowel also dehydr-.

Origin: A borrowing from German. Etymon: German dehydro-.

Etymology: < German dehydro- < de- de- prefix + hydro- hydro- comb. form. Compare anhydro- comb. form.In dehydrotriacetonamine n. at sense (b) < German Dehydrotriacetonamin (1874) dehydro- dehydro- comb. form + Triacetonamin (1874 or earlier; < tri- tri- comb. form + Acetonamin acetonamine n.).In dehydrocholesterol n. at sense (b) after German Dehydro-cholesteryl (A. Windaus et al. 1935, in Ann. Chem. 1020 106; < dehydro- dehydro- comb. form + Cholesteryl cholesteryl n. at cholester- comb. form ).

Chemistry.

A combining form used in forming the names of some organic compounds, denoting (a) the loss of one atom of hydrogen (or frequently two), (b) the loss of a molecule of water (= anhydro- comb. form); as dehydrotriacetonamine n. deˌhydroaˈscorbic acid n. an oxidation product, C₆H₆O₆, of ascorbic acid. deˌhydrochoˈlesterol n. the provitamin, C₂₇H₄₄O, of vitamin D₃, naturally formed in human and animal skin under the influence of sunlight.

ΚΠ

1877 H. Watts Fownes's Man. Elem. Chem. (ed. 12) II. 264 Triacetonamine, C₉H₁₇NO... Dehydrotriacetonamine, C₉H₁₅N.

1933 Nature 3 June 800/2 We found that by the action of a copper acetate solution upon ascorbic acid, a dehydroascorbic acid is formed.

1935 Chem. Abstr. XXIX. 7995 (title) 7-Dehydrocholesterol.

1935 Chem. Abstr. XXIX. 7995 7-Hydrocholesterol..with BzCl in C₅H₅N gives a dibenzoate... Heating..gives 58% of the benzoate..of 7-dehydrocholesterol.

1946 Nature 3 Aug. 169/1 The preparation from cholesterol (I) of 7-dehydrocholesterol (III), which on irradiation gave a highly antirachitic product (vitamin D₃).

1959 New Biol. 29 35 Dehydroascorbic acid, the oxidized form of vitamin C, is reported as having been obtained..from seawater.

1962 H. Heath in A. Pirie Lens Metabolism 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.

1965 Nomencl. 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.

1968 R. 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).

This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022).

单词	dehydro-
释义	dehydro-comb. form Stress is usually determined by a subsequent element and vowels may be reduced accordingly. Some degree of stress is usually maintained on the second syllable. If the subsequent element is an existing word, it is likely to retain its original stress pattern, e.g. dehydroascorbic acid n. Brit. /diːˌhʌɪdrəʊəskɔːbɪk ˈasɪd/, U.S. /diˈˌhaɪdroʊəˌskɔrbɪk ˈæsəd/. Forms: before a vowel also dehydr-. Origin: A borrowing from German. Etymon: German dehydro-. Etymology: < German dehydro- < de- de- prefix + hydro- hydro- comb. form. Compare anhydro- comb. form.In dehydrotriacetonamine n. at sense (b) < German Dehydrotriacetonamin (1874) dehydro- dehydro- comb. form + Triacetonamin (1874 or earlier; < tri- tri- comb. form + Acetonamin acetonamine n.).In dehydrocholesterol n. at sense (b) after German Dehydro-cholesteryl (A. Windaus et al. 1935, in Ann. Chem. 1020 106; < dehydro- dehydro- comb. form + Cholesteryl cholesteryl n. at cholester- comb. form ). Chemistry. A combining form used in forming the names of some organic compounds, denoting (a) the loss of one atom of hydrogen (or frequently two), (b) the loss of a molecule of water (= anhydro- comb. form); as dehydrotriacetonamine n. deˌhydroaˈscorbic acid n. an oxidation product, C₆H₆O₆, of ascorbic acid. deˌhydrochoˈlesterol n. the provitamin, C₂₇H₄₄O, of vitamin D₃, naturally formed in human and animal skin under the influence of sunlight. ΚΠ 1877 H. Watts Fownes's Man. Elem. Chem. (ed. 12) II. 264 Triacetonamine, C₉H₁₇NO... Dehydrotriacetonamine, C₉H₁₅N. 1933 Nature 3 June 800/2 We found that by the action of a copper acetate solution upon ascorbic acid, a dehydroascorbic acid is formed. 1935 Chem. Abstr. XXIX. 7995 (title) 7-Dehydrocholesterol. 1935 Chem. Abstr. XXIX. 7995 7-Hydrocholesterol..with BzCl in C₅H₅N gives a dibenzoate... Heating..gives 58% of the benzoate..of 7-dehydrocholesterol. 1946 Nature 3 Aug. 169/1 The preparation from cholesterol (I) of 7-dehydrocholesterol (III), which on irradiation gave a highly antirachitic product (vitamin D₃). 1959 New Biol. 29 35 Dehydroascorbic acid, the oxidized form of vitamin C, is reported as having been obtained..from seawater. 1962 H. Heath in A. Pirie Lens Metabolism 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. 1965 Nomencl. 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. 1968 R. 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). This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022). < comb. form1877
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