acentricadj.

Brit.

/(ˌ)eɪˈsɛntrɪk/, U.S.

/eɪˈsɛntrɪk/

Origin: Formed within English, by derivation. Etymons: a- prefix⁶, -centric comb. form.

Etymology: < a- prefix⁶ + -centric comb. form. With sense 1a compare Hellenistic Greek ἄκεντρος not occupying a cardinal point (already in ancient Greek in senses ‘stingless’, ‘without thorns’, ‘without a spur’). N.E.D. (1884) gives the pronunciation as (ăse·ntrik) /əˈsɛntrɪk/.

a. Having no centre. Also: not located centrally.

ΘΚΠ

the world > relative properties > number > geometry > [adjective] > geometrical property

acentric1831

orientated1857

convex1858

unicursal1866

oriented1875

dual1910

concave1942

traceless1966

1831 Mechanics' Mag. 11 June 226/1 The name Acentric has been given to a wheel, that has neither axis nor radii, and which, consequently, does not revolve round a pivot, like ordinary wheels... It..conveys the idea of a wheel that moves without resting on its centre or fulcrum.

1852 D. F. Gregory Treat. Solid Geom. (ed. 2) 77 Acentric Surfaces: the general equation to these may be put in the form [etc.].

1910 V. E. Johnson Theory & Pract. Model Aeroplaning iii. 16 If the propulsive action does not pass through the centre of gravity the system again becomes ‘acentric’.

1950 Jrnl. Paleontol. 24 342/2 Individual plates depressed conical, with elevated acentric apices.

1996 P. Redding Hegel's Hermeneutics i. 26 Notions like ‘up’ and ‘down’ are, in an acentric universe.., relative.

b. figurative. Having no unifying central force or element; lacking cohesion.

ΚΠ

1898 G. Pearlson Twelve Cent. of Jewish Persecution iii. 129 Thirty more links in the golden chain which binds not only an acentric people into one cohering community, but a glorious past with a glorious future.

1961 E. E. Lowinsky Tonality & Atonality in 16th-cent. Music Pref. p. xii ‘Tonality’ stands for a tonally centered organization, ‘atonality’ for a tonally acentric organization of music.

1970 Nature 28 Nov. 884/1 Acentric societies have no central element; in response to external changes they fragment, members going their separate ways.

2003 Washington Times (Nexis) 13 Apr. b8 Perhaps the greatest question about the value of identity groups in 21st century America is..whether an ‘acentric’ liberal civilization can survive the age now upon us.

2. Molecular Biology. Of a chromosome: having no centromere.

ΘΚΠ

the world > life > biology > biological processes > genetic activity > genetic components > [adjective] > chromosome > centromere

acentric1899

telomitic1917

centric1937

paracentric1938

pericentric1938

metacentric1939

telocentric1939

centromeric1941

multicentric1941

polycentric1943

acrocentric1945

subtelocentric1954

submetacentric1957

subacrocentric1960

1899 Jrnl. Royal Microsc. Soc. 499 The development of the achromatic fibres corresponds in many respects to that described by Mitzkewitsch in the case of Spirogyra. It is monaxial and acentric, there being no indication of an extra-nuclear centre.

1936 Jrnl. Genetics 33 487 One of these joins has two centromeres; it is dicentric. The other has no centromeres; it is acentric.

1968 Brit. Jrnl. Psychiatry 114 1170/2 In eight of these women a small proportion of cells contained large acentric fragments usually similar in size to chromosomes of the X–6–12 group.

2010 D. L. Hartl Essent. Genetics (ed. 5) v. 154/2 Acentric chromosomes are genetically unstable because they cannot be maneuvered properly during cell division and are lost.

This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).

单词	acentric
释义	acentricadj. Brit. /(ˌ)eɪˈsɛntrɪk/, U.S. /eɪˈsɛntrɪk/ Origin: Formed within English, by derivation. Etymons: a- prefix⁶, -centric comb. form. Etymology: < a- prefix⁶ + -centric comb. form. With sense 1a compare Hellenistic Greek ἄκεντρος not occupying a cardinal point (already in ancient Greek in senses ‘stingless’, ‘without thorns’, ‘without a spur’). N.E.D. (1884) gives the pronunciation as (ăse·ntrik) /əˈsɛntrɪk/. 1. a. Having no centre. Also: not located centrally. ΘΚΠ the world > relative properties > number > geometry > [adjective] > geometrical property acentric1831 orientated1857 convex1858 unicursal1866 oriented1875 dual1910 concave1942 traceless1966 1831 Mechanics' Mag. 11 June 226/1 The name Acentric has been given to a wheel, that has neither axis nor radii, and which, consequently, does not revolve round a pivot, like ordinary wheels... It..conveys the idea of a wheel that moves without resting on its centre or fulcrum. 1852 D. F. Gregory Treat. Solid Geom. (ed. 2) 77 Acentric Surfaces: the general equation to these may be put in the form [etc.]. 1910 V. E. Johnson Theory & Pract. Model Aeroplaning iii. 16 If the propulsive action does not pass through the centre of gravity the system again becomes ‘acentric’. 1950 Jrnl. Paleontol. 24 342/2 Individual plates depressed conical, with elevated acentric apices. 1996 P. Redding Hegel's Hermeneutics i. 26 Notions like ‘up’ and ‘down’ are, in an acentric universe.., relative. b. figurative. Having no unifying central force or element; lacking cohesion. ΚΠ 1898 G. Pearlson Twelve Cent. of Jewish Persecution iii. 129 Thirty more links in the golden chain which binds not only an acentric people into one cohering community, but a glorious past with a glorious future. 1961 E. E. Lowinsky Tonality & Atonality in 16th-cent. Music Pref. p. xii ‘Tonality’ stands for a tonally centered organization, ‘atonality’ for a tonally acentric organization of music. 1970 Nature 28 Nov. 884/1 Acentric societies have no central element; in response to external changes they fragment, members going their separate ways. 2003 Washington Times (Nexis) 13 Apr. b8 Perhaps the greatest question about the value of identity groups in 21st century America is..whether an ‘acentric’ liberal civilization can survive the age now upon us. 2. Molecular Biology. Of a chromosome: having no centromere. ΘΚΠ the world > life > biology > biological processes > genetic activity > genetic components > [adjective] > chromosome > centromere acentric1899 telomitic1917 centric1937 paracentric1938 pericentric1938 metacentric1939 telocentric1939 centromeric1941 multicentric1941 polycentric1943 acrocentric1945 subtelocentric1954 submetacentric1957 subacrocentric1960 1899 Jrnl. Royal Microsc. Soc. 499 The development of the achromatic fibres corresponds in many respects to that described by Mitzkewitsch in the case of Spirogyra. It is monaxial and acentric, there being no indication of an extra-nuclear centre. 1936 Jrnl. Genetics 33 487 One of these joins has two centromeres; it is dicentric. The other has no centromeres; it is acentric. 1968 Brit. Jrnl. Psychiatry 114 1170/2 In eight of these women a small proportion of cells contained large acentric fragments usually similar in size to chromosomes of the X–6–12 group. 2010 D. L. Hartl Essent. Genetics (ed. 5) v. 154/2 Acentric chromosomes are genetically unstable because they cannot be maneuvered properly during cell division and are lost. This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021). < adj.1831
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