homopolaradj.

/hɒməʊˈpəʊlə/

Etymology: < homo- comb. form + polar adj.

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1. Botany. Having equal poles, as in the figures called Stauraxonia homopola (1883 Encycl. Brit. XVI. 844).

2. Of an electric generator or its operation: having or involving such an arrangement of magnets that the direction of the flux does not alternate with relation to the motion of the armature conductor(s), so that a direct current is generated without the use of commutators.

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the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > generator > [adjective] > generating direct current

homopolar1896

1896 S. P. Thompson Dynamo-electr. Machinery (ed. 5) 475 (heading) Homopolar (‘unipolar’) dynamos.

1896 S. P. Thompson Dynamo-electr. Machinery (ed. 5) 475 Where the motion is such that the conductor moves continuously past poles of one kind only, the inductive operation is said to be homopolar.

1938 J. W. Meares & R. E. Neale Electr. Engin. Pract. I. (ed. 5) iv. 233 A homopolar dynamo is essentially a low voltage, heavy-current machine, but..it is generally more satisfactory to employ a motor generator driven from the ordinary supply mains.

1962 D. R. Corson & P. Lorrain Introd. Electromagn. Fields 530 Consider the Faraday disk or, as it is also called, the homo~polar generator.

3. Chemistry. [ < German homöopolar (R. Abegg 1906, in Zeitschr. f. anorg. Chem. L. 309); compare homoeopolar adj. at homoeo- comb. form .] Formed by or arising out of the sharing of electrons between neutral atoms, without ionization; covalent.

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the world > matter > chemistry > chemical bonding > [adjective] > of or relating to covalent bonding

homopolar1922

1922 C. H. Desch Metallogr. (ed. 3) xv. 341 In all probability the new theory of valency based on the distribution of electrons in the molecule, will provide a satisfactory explanation of the formulæ of compounds of electrically similar (‘homopolar’) elements.

1930 G. Thomson Atom 219 In such compounds the two atoms are on an equal footing and the compounds are called homopolar.

1940 N. F. Mott & R. W. Gurney Electronic Processes in Ionic Crystals i. 9 The transition from polar to homopolar binding.

1972 M. H. Battey Mineral. for Students i. 9/1 The covalent (or homopolar) bond is formed when two atoms..share a pair of electrons, one electron being supplied by each atom.

Derivatives

homopolic adj. /-ˈpɒlɪk/ = sense 1.

ΘΚΠ

the world > plants > part of plant > (defined by) distribution, arrangement, or position > [adjective] > having equal poles

homopolic1883

1883 P. Geddes in Encycl. Brit. XVI. 845/1 Questions of symmetry, for which Haeckel's nomenclature of homaxonial, homopolic, etc. is distinctly preferable.

This entry has not yet been fully updated (first published 1976; most recently modified version published online December 2019).

单词	homopolar
释义	homopolaradj. /hɒməʊˈpəʊlə/ Etymology: < homo- comb. form + polar adj. Categories » 1. Botany. Having equal poles, as in the figures called Stauraxonia homopola (1883 Encycl. Brit. XVI. 844). 2. Of an electric generator or its operation: having or involving such an arrangement of magnets that the direction of the flux does not alternate with relation to the motion of the armature conductor(s), so that a direct current is generated without the use of commutators. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > generator > [adjective] > generating direct current homopolar1896 1896 S. P. Thompson Dynamo-electr. Machinery (ed. 5) 475 (heading) Homopolar (‘unipolar’) dynamos. 1896 S. P. Thompson Dynamo-electr. Machinery (ed. 5) 475 Where the motion is such that the conductor moves continuously past poles of one kind only, the inductive operation is said to be homopolar. 1938 J. W. Meares & R. E. Neale Electr. Engin. Pract. I. (ed. 5) iv. 233 A homopolar dynamo is essentially a low voltage, heavy-current machine, but..it is generally more satisfactory to employ a motor generator driven from the ordinary supply mains. 1962 D. R. Corson & P. Lorrain Introd. Electromagn. Fields 530 Consider the Faraday disk or, as it is also called, the homo~polar generator. 3. Chemistry. [ < German homöopolar (R. Abegg 1906, in Zeitschr. f. anorg. Chem. L. 309); compare homoeopolar adj. at homoeo- comb. form .] Formed by or arising out of the sharing of electrons between neutral atoms, without ionization; covalent. ΘΚΠ the world > matter > chemistry > chemical bonding > [adjective] > of or relating to covalent bonding homopolar1922 1922 C. H. Desch Metallogr. (ed. 3) xv. 341 In all probability the new theory of valency based on the distribution of electrons in the molecule, will provide a satisfactory explanation of the formulæ of compounds of electrically similar (‘homopolar’) elements. 1930 G. Thomson Atom 219 In such compounds the two atoms are on an equal footing and the compounds are called homopolar. 1940 N. F. Mott & R. W. Gurney Electronic Processes in Ionic Crystals i. 9 The transition from polar to homopolar binding. 1972 M. H. Battey Mineral. for Students i. 9/1 The covalent (or homopolar) bond is formed when two atoms..share a pair of electrons, one electron being supplied by each atom. Derivatives homopolic adj. /-ˈpɒlɪk/ = sense 1. ΘΚΠ the world > plants > part of plant > (defined by) distribution, arrangement, or position > [adjective] > having equal poles homopolic1883 1883 P. Geddes in Encycl. Brit. XVI. 845/1 Questions of symmetry, for which Haeckel's nomenclature of homaxonial, homopolic, etc. is distinctly preferable. This entry has not yet been fully updated (first published 1976; most recently modified version published online December 2019). < adj.1883
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