英语词汇oxa-的发音释义、词根词缀、结构分析、同源词、词频及词根记忆法-英语词根词缀词典

oxa- or (before a vowel) ox-

combining form

indicating that a chemical compound contains oxygen, used esp to denote that a heterocyclic compound is derived from a specified compound by replacement of a carbon atom with an oxygen atom

⇒ oxazine

oxa-Chemistry

a prefix meaning 'oxygen when it replaces carbon'.

oxa-Also before vowels ox-.Combining element in systematic chemical names used to denote the presence of an oxygen atom (regarded as replacing a {b1}CH₂{b1} group), as in 6-oxa-3-thiadecanenitrile, 1H-2-oxapyrene, oxirane, oxolane.1928Jrnl. Amer. Chem. Soc. L. 3075 In order to avoid confusion with the ordinary meanings of oxy-, thio-, azo-, etc., it is recommended that the forms oxa-, thia-, aza-, etc., be employed to indicate the presence of hetero atoms in a ring (the a being dropped before a vowel).1971Nomencl. Org. Chem. (I.U.P.A.C.) (ed. 3) B. 53 (table) Element Oxygen..Prefix Oxa.

oxa- /ˈɒksə/ combining form. Before a vowel ox-. E20.

ORIGIN: from ox(y- + -a-.

Organic Chemistry. Denoting the presence of an oxygen atom regarded as replacing a methylene (·CH₂·) group.

oxa-
combining form
or ox-
Etymology: International Scientific Vocabulary, from ox- (I) + -a-
: containing oxygen in place of carbon or regarded as in place of carbon usually in place of the methylene group −CH₂−
< 10H-9-oxaanthracene >
< oxazacycloheptane >
— compare aza-, thia-

词汇	oxa-
词根词缀	Collins Macquarie OED SOED Webster oxa- or (before a vowel) ox- combining form indicating that a chemical compound contains oxygen, used esp to denote that a heterocyclic compound is derived from a specified compound by replacement of a carbon atom with an oxygen atom ⇒ oxazine oxa-Chemistry a prefix meaning 'oxygen when it replaces carbon'. oxa-Also before vowels ox-.Combining element in systematic chemical names used to denote the presence of an oxygen atom (regarded as replacing a {b1}CH₂{b1} group), as in 6-oxa-3-thiadecanenitrile, 1H-2-oxapyrene, oxirane, oxolane.1928Jrnl. Amer. Chem. Soc. L. 3075 In order to avoid confusion with the ordinary meanings of oxy-, thio-, azo-, etc., it is recommended that the forms oxa-, thia-, aza-, etc., be employed to indicate the presence of hetero atoms in a ring (the a being dropped before a vowel).1971Nomencl. Org. Chem. (I.U.P.A.C.) (ed. 3) B. 53 (table) Element Oxygen..Prefix Oxa. oxa- /ˈɒksə/ combining form. Before a vowel ox-. E20. ORIGIN: from ox(y- + -a-. Organic Chemistry. Denoting the presence of an oxygen atom regarded as replacing a methylene (·CH₂·) group. oxa- combining form or ox- Etymology: International Scientific Vocabulary, from ox- (I) + -a- : containing oxygen in place of carbon or regarded as in place of carbon usually in place of the methylene group −CH₂− < 10H-9-oxaanthracene > < oxazacycloheptane > — compare aza-, thia-
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