eicos-eicosa-eikos-comb. form

Stress is usually determined by a subsequent element and vowels may be reduced accordingly, e.g. eicosane Brit.

/ˈʌɪkə(ʊ)seɪn/, U.S.

/ˈaɪkəˌseɪn/.

Forms: 1900s– eicos-, 1900s– eicosa-, 1900s– eikos-.

Etymology: < ancient Greek εἰκοσ- (also εἰκοσι), combining form (in e.g. εἰκοσάβοιος worth twenty oxen) of εἴκοσι twenty. Compare icos- comb. form.

= icos- comb. form.

ΚΠ

1909 Webster's New Internat. Dict. Eng. Lang. Eikosane, Chem., a solid hydrocarbon, C₂₀H₄₂, of the methane series, of artificial production, and also occurring in petroleum.

1958 Jrnl. Brit. Interplanetary Soc. 16 442 Values of specific impulse for heptane, octane, decane and eicosane oxidized by WFNA have been calculated.

1964 J. A. Lovern in Oceanogr. & Marine Biol. II. 188 Lipids from fish mitochondria are, like fish depot lipids, low in arachidonic acid but rich in eicosapentaenoic and docosahexaenoic acids.

1968 New Scientist 18 July 142/1 This eicosanucleotide (a string of 20 nucleoside beads)..is the longest that needs to be synthesized by purely chemical methods.

Draft additions January 2018

eicosapentaenoic acid n.

Brit.

/ˌʌɪkəʊsəpɛntəiːˌnəʊɪk ˈasɪd/

U.S.

/ˌaɪkoʊsəˌpɛn(t)əiˌnoʊɪk ˈæsəd/

(in early use also eicosapentenoic acid) Biochemistry any fatty acid having a straight chain of twenty carbon atoms containing five double bonds.These polyunsaturated fatty acids, found in especially high concentration in fish oils, are precursors of a series of prostaglandins, and are believed to have anti-inflammatory and antithrombotic effects.

ΚΠ

1921 Science 26 Aug. 175/2 Analysis of the fractions gave good evidence for the presence of the following acids—..eicosapentenoic, C₂₀H₃₀O₂.

1938 H. K. Dean Utilization Fats i. 17 Toyama and Tsuchiya have examined this acid by ozonolysis of the amyl ester and suggest that the structure is Δ^{4, 8, 12, 15, 18}-eicosapentaenoic acid.

1979 Brit. Med. Jrnl. 17 Feb. 484/2 The low incidence of myocardial infarction in Eskimos and their increased tendency to bleed are probably due to the high eicosapentaenoic acid and low linoleic and arachidonic acid content of their diet.

2009 Atlantic Monthly Apr. 100/1 Oil taken from Chinese water snakes is rich in Eicosapentaenoic acid, an omega-3 fatty acid that leading scientists believe can relieve chronic joint pain.

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

单词	eicos-
释义	eicos-eicosa-eikos-comb. form Stress is usually determined by a subsequent element and vowels may be reduced accordingly, e.g. eicosane Brit. /ˈʌɪkə(ʊ)seɪn/, U.S. /ˈaɪkəˌseɪn/. Forms: 1900s– eicos-, 1900s– eicosa-, 1900s– eikos-. Etymology: < ancient Greek εἰκοσ- (also εἰκοσι), combining form (in e.g. εἰκοσάβοιος worth twenty oxen) of εἴκοσι twenty. Compare icos- comb. form. = icos- comb. form. ΚΠ 1909 Webster's New Internat. Dict. Eng. Lang. Eikosane, Chem., a solid hydrocarbon, C₂₀H₄₂, of the methane series, of artificial production, and also occurring in petroleum. 1958 Jrnl. Brit. Interplanetary Soc. 16 442 Values of specific impulse for heptane, octane, decane and eicosane oxidized by WFNA have been calculated. 1964 J. A. Lovern in Oceanogr. & Marine Biol. II. 188 Lipids from fish mitochondria are, like fish depot lipids, low in arachidonic acid but rich in eicosapentaenoic and docosahexaenoic acids. 1968 New Scientist 18 July 142/1 This eicosanucleotide (a string of 20 nucleoside beads)..is the longest that needs to be synthesized by purely chemical methods. Draft additions January 2018 eicosapentaenoic acid n. Brit. /ˌʌɪkəʊsəpɛntəiːˌnəʊɪk ˈasɪd/ , U.S. /ˌaɪkoʊsəˌpɛn(t)əiˌnoʊɪk ˈæsəd/ (in early use also eicosapentenoic acid) Biochemistry any fatty acid having a straight chain of twenty carbon atoms containing five double bonds.These polyunsaturated fatty acids, found in especially high concentration in fish oils, are precursors of a series of prostaglandins, and are believed to have anti-inflammatory and antithrombotic effects. ΚΠ 1921 Science 26 Aug. 175/2 Analysis of the fractions gave good evidence for the presence of the following acids—..eicosapentenoic, C₂₀H₃₀O₂. 1938 H. K. Dean Utilization Fats i. 17 Toyama and Tsuchiya have examined this acid by ozonolysis of the amyl ester and suggest that the structure is Δ^{4, 8, 12, 15, 18}-eicosapentaenoic acid. 1979 Brit. Med. Jrnl. 17 Feb. 484/2 The low incidence of myocardial infarction in Eskimos and their increased tendency to bleed are probably due to the high eicosapentaenoic acid and low linoleic and arachidonic acid content of their diet. 2009 Atlantic Monthly Apr. 100/1 Oil taken from Chinese water snakes is rich in Eicosapentaenoic acid, an omega-3 fatty acid that leading scientists believe can relieve chronic joint pain. This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2022). < comb. form1909
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