planaradj.

Brit.

/ˈpleɪnə/, U.S.

/ˈpleɪnər/

Origin: Formed within English, by derivation. Etymons: plane n.³, -ar suffix¹.

Etymology: < plane n.³ + -ar suffix¹, after linear adj. Compare post-classical Latin planaris (5th cent.).

1. Of or relating to a plane; (having parts) situated in or forming a plane or (esp. parallel) planes; flat, two-dimensional.

ΘΚΠ

the world > relative properties > number > geometry > surface > [adjective] > relating to plane surfaces

planimetrical1650

plane1666

planary1668

planimetric1828

planar1850

planometric1882

the world > space > shape > flatness or levelness > [adjective] > belonging or related to plane surface

planar1931

1850 A. Cayley Coll. Math. Papers I. 505 I propose to term the family of developables treated of in this paper, ‘planar developables’... The developable which is the envelope of such a system [of n different planes] may be termed a ‘multiplanar developable’, and in the particular case of n being equal to unity, we have a planar developable.

1864 J. J. Sylvester in Philos. Trans. (Royal Soc.) 154 644 The plane of D itself [has been resolved]..into two planar regions on opposite sides of the line.

1900 Science 15 June 944/1 A set of screens, cameras, and a selection of anastigmatic and planar lenses which provide for almost every contingency of indoor and outdoor work, including photomicrography and projection.

1931 Proc. National Acad. Sci. U.S.A. 17 127 A topological graph is called planar if it can be mapped in a 1–1 continuous manner on a plane (or sphere).

1942 M. P. Billings Struct. Geol. xvi. 307 A clear distinction between primary and secondary planar and linear structures is essential for a correct interpretation of the tectonics of plutons.

1972 J. G. Dennis Struct. Geol. xx. 459 Other criteria of high-pressure shock origin include sets of closely spaced planes in quartz crystals... These planar features are known in quartz that has been subjected to nuclear explosions.

1990 Jrnl. Exper. Bot. 41 817/2 More than half the root transverse fractures produced surfaces that were sufficiently planar for electron probe microanalysis (EPMA).

2. Electronics. Of a thermionic valve: having plane-parallel electrodes, usually close together.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > thermionic valve > [adjective] > specific types of valve

thoriated1922

bright-emitting1924

multi-electrode1926

variable-mu1930

planar1937

1937 Proc. Royal Soc. A. 161 382 When this potential V has been found it can be used to find a first approximation to the electron current..by substituting in the formula..for the equivalent planar diode, that is the case where the anode and cathode are infinite planes distant a from each other.

1956 A. L. Albert Electronics & Electron Devices viii. 307 Tubes for handling a few watts or less at very high frequencies commonly use parallel electrodes and sometimes are called planar tubes.

1965 J. W. Gewartowski & H. A. Watson Princ. Electron Tubes iv. 120 If the linear dimensions of a planar diode are increased by a factor k, the same current flows to the anode for the same applied voltage.

1992 RS Components: Electronic & Electr. Products July 739/2 A range of silicon planar zener diodes intended for use as low voltage stabilisers or voltage references. DO-35 envelopes, ±5% range.

3. Electronics. Designating or relating to a solid-state device having boundaries of a number of different n- and p-type regions lying in a single plane. Also: designating a process in which such devices are made by the diffusion of impurities into a semiconductor substrate through holes etched in a thin masking layer of silicon oxide.

ΘΚΠ

the world > matter > physics > solid state physics > semiconductivity > [adjective] > other attributes of semiconductors or devices

unipolar1952

planar1965

1965 Wireless World July 325/1 Tr 1 and Tr 2 are low noise, high gain silicon planar transistors.

1967 A. S. Grove Physics & Technol. Semiconductor Devices 3 The planar technology..combines the advantages of junction formation by solid-state diffusion and the masking property of silicon dioxide for precise definition of device geometry.

1975 D. G. Fink Electronics Engineers' Handbk. vii. 37 The significance of the planar process is that the pn junctions are terminated and protected beneath a silicon oxide layer. Thus many of the surface problems associated with other types of transistor fabrication techniques, i.e., high leakage currents and poor low-current dc gain, are eliminated.

1990 Austral. Personal Computer Feb. 87/3 At about the same time, Fairchild Semiconductor introduced the planar transistor. Planar processing created a transistor in which all three electrical connections reside on one surface of the device.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	planar
释义	planaradj. Brit. /ˈpleɪnə/, U.S. /ˈpleɪnər/ Origin: Formed within English, by derivation. Etymons: plane n.³, -ar suffix¹. Etymology: < plane n.³ + -ar suffix¹, after linear adj. Compare post-classical Latin planaris (5th cent.). 1. Of or relating to a plane; (having parts) situated in or forming a plane or (esp. parallel) planes; flat, two-dimensional. ΘΚΠ the world > relative properties > number > geometry > surface > [adjective] > relating to plane surfaces planimetrical1650 plane1666 planary1668 planimetric1828 planar1850 planometric1882 the world > space > shape > flatness or levelness > [adjective] > belonging or related to plane surface planar1931 1850 A. Cayley Coll. Math. Papers I. 505 I propose to term the family of developables treated of in this paper, ‘planar developables’... The developable which is the envelope of such a system [of n different planes] may be termed a ‘multiplanar developable’, and in the particular case of n being equal to unity, we have a planar developable. 1864 J. J. Sylvester in Philos. Trans. (Royal Soc.) 154 644 The plane of D itself [has been resolved]..into two planar regions on opposite sides of the line. 1900 Science 15 June 944/1 A set of screens, cameras, and a selection of anastigmatic and planar lenses which provide for almost every contingency of indoor and outdoor work, including photomicrography and projection. 1931 Proc. National Acad. Sci. U.S.A. 17 127 A topological graph is called planar if it can be mapped in a 1–1 continuous manner on a plane (or sphere). 1942 M. P. Billings Struct. Geol. xvi. 307 A clear distinction between primary and secondary planar and linear structures is essential for a correct interpretation of the tectonics of plutons. 1972 J. G. Dennis Struct. Geol. xx. 459 Other criteria of high-pressure shock origin include sets of closely spaced planes in quartz crystals... These planar features are known in quartz that has been subjected to nuclear explosions. 1990 Jrnl. Exper. Bot. 41 817/2 More than half the root transverse fractures produced surfaces that were sufficiently planar for electron probe microanalysis (EPMA). 2. Electronics. Of a thermionic valve: having plane-parallel electrodes, usually close together. ΘΚΠ the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > thermionic valve > [adjective] > specific types of valve thoriated1922 bright-emitting1924 multi-electrode1926 variable-mu1930 planar1937 1937 Proc. Royal Soc. A. 161 382 When this potential V has been found it can be used to find a first approximation to the electron current..by substituting in the formula..for the equivalent planar diode, that is the case where the anode and cathode are infinite planes distant a from each other. 1956 A. L. Albert Electronics & Electron Devices viii. 307 Tubes for handling a few watts or less at very high frequencies commonly use parallel electrodes and sometimes are called planar tubes. 1965 J. W. Gewartowski & H. A. Watson Princ. Electron Tubes iv. 120 If the linear dimensions of a planar diode are increased by a factor k, the same current flows to the anode for the same applied voltage. 1992 RS Components: Electronic & Electr. Products July 739/2 A range of silicon planar zener diodes intended for use as low voltage stabilisers or voltage references. DO-35 envelopes, ±5% range. 3. Electronics. Designating or relating to a solid-state device having boundaries of a number of different n- and p-type regions lying in a single plane. Also: designating a process in which such devices are made by the diffusion of impurities into a semiconductor substrate through holes etched in a thin masking layer of silicon oxide. ΘΚΠ the world > matter > physics > solid state physics > semiconductivity > [adjective] > other attributes of semiconductors or devices unipolar1952 planar1965 1965 Wireless World July 325/1 Tr 1 and Tr 2 are low noise, high gain silicon planar transistors. 1967 A. S. Grove Physics & Technol. Semiconductor Devices 3 The planar technology..combines the advantages of junction formation by solid-state diffusion and the masking property of silicon dioxide for precise definition of device geometry. 1975 D. G. Fink Electronics Engineers' Handbk. vii. 37 The significance of the planar process is that the pn junctions are terminated and protected beneath a silicon oxide layer. Thus many of the surface problems associated with other types of transistor fabrication techniques, i.e., high leakage currents and poor low-current dc gain, are eliminated. 1990 Austral. Personal Computer Feb. 87/3 At about the same time, Fairchild Semiconductor introduced the planar transistor. Planar processing created a transistor in which all three electrical connections reside on one surface of the device. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < adj.1850
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