Geometry. A straight line passing through the centre of a circle (or sphere), and terminated at each end by its circumference (or surface). Hence…
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| 释义 | the world > relative properties > number > geometry > line > [noun] > over circle or sphere (9) diameter1387 Geometry. A straight line passing through the centre of a circle (or sphere), and terminated at each end by its circumference (or surface). Hence… dimetient?a1560 (Short for dimetient line at sense A. 1). = diameter, n. beam1570 Mathematics. The radius of a circle, an axial line. (Translating Latin radius, apparently from the association of beam and ray of light.) Obsolete. dimetient line1601 That measures across through the centre: dimetient line = diameter, n. Obsolete. radiusa1657 figurative. Something imagined as resembling the radius of a circle, as one of a set of links to a central point, as the measure of radial growth… diametral1658 A diametral line, diameter. ray1690 Mathematics. A radius of a circle; = radius, n. 4a. Now rare. geodetic1850 Geometry. = geodesic, n. 1 geodesic1856 Geometry. A geodesic line (cf. sense A. 3). |
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