semidiametern.

Etymology: late Latin (Boethius): see semi- prefix 2b(b).Previous versions of the OED give the stress as: ˌsemidiˈameter.

a. The half of a diameter.

ΘΚΠ

the world > space > extension in space > measurable spatial extent > thickness > [noun] > diameter > half of diameter

semidiameter1551

1551 R. Record Pathway to Knowl. i. Defin. Diameters, whose halfe, I meane from the center to the circumference any waie, is called the semidiameter, or halfe diameter.

1625 N. Carpenter Geogr. Delineated i. v. 117 Astronomers who measure the magnitude of the greatest Starres by Diameters & Semidiameters of the Earth.

1648 Bp. J. Wilkins Math. Magick i. vi. 38 That dis-proportion of distance, which there is betwixt the Semidiameter of the Cylinder AB, and the Semidiameter of the rundle with the spokes FA.

1709 G. Berkeley Ess. New Theory of Vision §44. 47 Fifty or Sixty Semidiameters of the Earth distant from me.

1764 Ann. Reg. 1763 106 A curious halo appeared round the moon. Its semidiameter, from the lower limb of the planet to the opposite arch of the phenomenon, was very near twenty-one degrees and a half.

1814 J. Playfair Outl. Nat. Philos. II. i. xiv. 213 23659 semidiameters of the Earth, or 93595000 miles.

1885 J. Casey Treat. Analyt. Geom. 188 If any tangent meets two conjugate semidiameters of an ellipse.

figurative.1614 T. Jackson Third Bk. Comm. Apostles Creede iii. xii. 224 By so much doth the Pope..make his authoritie..greater then Christs, which is the semidiameter of this mouth of blasphemies.1822 S. T. Coleridge Coll. Lett. (1971) V. 213 Offence is of course three semi-diameters of the orbit of Common Sense on the other side of Possibility.

b. Fortification. (See quot. 1704).

ΘΚΠ

society > armed hostility > defence > defensive work(s) > [noun] > construction of defensive works > guiding lines

capital1631

semidiameter1669

magistral line1828

magistral1853

1669 P. Staynred Compend. Fortification 1 in S. Sturmy Mariners Mag. The Semidiameter of the Outward Polygon.

1704 J. Harris Lexicon Technicum I Semi-diameter..is two-fold, viz. the Greater and Lesser: The former being a Line composed of the Capital, and the Small Semi-diameter of the Polygon: And the other, a Line drawn to the Circumference from the Centre thro' the Gorges.

Derivatives

semidiˈametral adj. that is a semidiameter.

ΘΚΠ

the world > relative properties > number > geometry > line > [adjective] > constituting a diameter

diametrical1553

diametral1555

semidiametral1678

diametric1868

1678 J. Moxon Mech. Exercises I. v. 86 The Semi-Diametral line proceeding from the Center.

This entry has not yet been fully updated (first published 1911; most recently modified version published online June 2020).

单词	semidiameter
释义	semidiametern. Etymology: late Latin (Boethius): see semi- prefix 2b(b).Previous versions of the OED give the stress as: ˌsemidiˈameter. a. The half of a diameter. ΘΚΠ the world > space > extension in space > measurable spatial extent > thickness > [noun] > diameter > half of diameter semidiameter1551 1551 R. Record Pathway to Knowl. i. Defin. Diameters, whose halfe, I meane from the center to the circumference any waie, is called the semidiameter, or halfe diameter. 1625 N. Carpenter Geogr. Delineated i. v. 117 Astronomers who measure the magnitude of the greatest Starres by Diameters & Semidiameters of the Earth. 1648 Bp. J. Wilkins Math. Magick i. vi. 38 That dis-proportion of distance, which there is betwixt the Semidiameter of the Cylinder AB, and the Semidiameter of the rundle with the spokes FA. 1709 G. Berkeley Ess. New Theory of Vision §44. 47 Fifty or Sixty Semidiameters of the Earth distant from me. 1764 Ann. Reg. 1763 106 A curious halo appeared round the moon. Its semidiameter, from the lower limb of the planet to the opposite arch of the phenomenon, was very near twenty-one degrees and a half. 1814 J. Playfair Outl. Nat. Philos. II. i. xiv. 213 23659 semidiameters of the Earth, or 93595000 miles. 1885 J. Casey Treat. Analyt. Geom. 188 If any tangent meets two conjugate semidiameters of an ellipse. figurative.1614 T. Jackson Third Bk. Comm. Apostles Creede iii. xii. 224 By so much doth the Pope..make his authoritie..greater then Christs, which is the semidiameter of this mouth of blasphemies.1822 S. T. Coleridge Coll. Lett. (1971) V. 213 Offence is of course three semi-diameters of the orbit of Common Sense on the other side of Possibility. b. Fortification. (See quot. 1704). ΘΚΠ society > armed hostility > defence > defensive work(s) > [noun] > construction of defensive works > guiding lines capital1631 semidiameter1669 magistral line1828 magistral1853 1669 P. Staynred Compend. Fortification 1 in S. Sturmy Mariners Mag. The Semidiameter of the Outward Polygon. 1704 J. Harris Lexicon Technicum I Semi-diameter..is two-fold, viz. the Greater and Lesser: The former being a Line composed of the Capital, and the Small Semi-diameter of the Polygon: And the other, a Line drawn to the Circumference from the Centre thro' the Gorges. Derivatives semidiˈametral adj. that is a semidiameter. ΘΚΠ the world > relative properties > number > geometry > line > [adjective] > constituting a diameter diametrical1553 diametral1555 semidiametral1678 diametric1868 1678 J. Moxon Mech. Exercises I. v. 86 The Semi-Diametral line proceeding from the Center. This entry has not yet been fully updated (first published 1911; most recently modified version published online June 2020). < n.1551
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