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Merriam-Webster's Collegiate Dictionary di·am·e·ter ETYMOLOGY Middle English diametre, from Middle French, from Latin diametros, from Greek, from dia- + metron measure — more at measure DATE 14th century 1. a chord passing through the center of a figure or body 2. the length of a straight line through the center of an object 3. a unit of enlargement used with a number to indicate magnification by a lens or optical system an object one millimeter wide magnified 40 diameters appears 40 millimeters wide English Etymology diameter late 14c., from O.Fr . diametre, from L. diametrus, from Gk.diametros "diagonal of a circle," from dia- "across, through" + metron "a measure" (see meter (2)).http://O.Fr Oxford Advanced Learner's Dictionary-牛津双解-OALD7 diameter diam·eter / dai5AmitE(r) / noun1. a straight line going from one side of a circle or any other round object to the other side, passing through the centre 直径；对径: the diameter of a tree trunk 树干的直径 The dome is 42.3 metres in diameter. 这个穹顶直径为 42.3 米。 ⇨ compare radius 2. (technical 术语) a measurement of the power of an instrument to magnify sth 放大率；放大倍数: a lens magnifying 300 diameters (= making sth look 300 times larger than it really is) 放大 300 倍的透镜 Oxford Collocations Dictionary for Students of English diameter noun ADJ. inside, internal The tubes have an internal diameter of 2mm. | external, outside | large, small VERB + DIAMETER calculate, find, measure He used similar triangles to calculate the diameter of the earth. | have PREP. in ~ The mirror is 25cm in diameter. Webster's Third New International Dictionary, Unabridged di·am·e·ter \dīˈaməd.ə(r), -mətə-\ noun (-s) Etymology: Middle English diametre, from Middle French, from Latin diametros, from Greek diametros, from dia- + -metros (from metron measure) — more at measure 1. a. : a chord passing through the center of a figure or body (as a circle, conic section, sphere, cube) b. : a line that bisects each of a system of parallel chords of a curve c. : a unit of magnification of microscopic and telescopic observations equal to the number of times the linear dimensions of the object are increased < a magnification of eight diameters means the dimensions are increased in the ratio of 8:1 > 2. a. : the length of a straight line through the center of an object : thickness < a tree two feet in diameter at the base of the trunk > < a rope one inch in diameter measured at its greatest dimension > b. : the distance through a column at its base used in architecture as a standard measure for all parts of an order — see module c. : one of the maximal breadths of a part of the body |
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