英 [daɪˈæmɪtə(r)] 美 [daɪˈæmɪtər]
n. 直径；放大倍数
复数diameters
diameter /daɪˈæmɪtə/ CET4 TEM4
可数名词 The diameter of a round object is the length of a straight line that can be drawn across it, passing through the middle of it. 直径
...a tube less than a fifth of the diameter of a human hair.
…一根直径不到头发五分之一的微管。
the length of a straight line passing through the center of a circle and connecting two points on the circumference
同义词： diam
a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)
底盘直径（Diameter）：17"
...:普通痣通常是棕黄色、棕色或黑色,而恶性黑色素瘤会在棕黄色或棕褐色基础上掺杂粉红色、白色、蓝黑色。其中,蓝色最为不祥,白色则提示肿瘤有自行性退变。结节型恶性黑色素瘤总是呈蓝黑色或灰色。 黑色素瘤和黑痣区别四:直径(diameter):普通痣直径一般小于5毫米,而恶性黑色素瘤直径大于5毫米。
... 聚偏二氟乙烯（PVDF 通径Diameter 工作压力Working pressure ...
技术： 详见产品展示——技术 定货指南： （1）订货型号填写：HRGB320A-1500-45 外径Diameter(mm) 单件承载（N） ..
diametrically 完全地；作为直径地；直接地；正好相反地
diam 直径
The dome is 42.3 metres in diameter.
这个穹顶直径为42.3米。
The axis of a circle is its diameter.
圆的对称中心线就是直径。
It turns out that the diameter is actually 2.5 centimeters.
它的直径实际上是 2.5 厘米。
And how that works is, as your number increases, the diameter gets smaller and smaller."
VOA : special.2009.05.18
They might be 100 nanometers or so in diameter, whereas, a cell is ten microns or so in diameter.
直径只有一百纳米左右,而一个细胞的直径是十微米左右
生物医学工程探索课程节选 : 耶鲁公开课
And, that's a good thing to know because if you come out with an answer that's somewhere near the diameter of the universe and it's supposed to be the diameter of an atom, then you will know that you probably made a mistake.
这是我们需要知道的,因为当你做一道题得到的答案,是宇宙的直径,而正确答案是原子直径时，你能很快发现你的错误。
固态化学导论课程节选 : 麻省理工公开课
The capsule is very narrow, about fifty-three centimeters in diameter.
VOA : special.2011.08.12
That cabin is a 14-ton spherical steel capsule only two meters in diameter, with a single,half-meter-wide circular plastic window for viewing.
VOA : standard.2010.06.21
Built by Mitsubishi Electric, it boasts a 59-foot-diameter, turtle-shell-shape antenna dubbed "Gamela, " after the Godzilla-slaying tortoise.
To the south, on Stocking Island, luminescent red starfish grow to over a foot in diameter.
Patch reef: small colonies of corals, sometimes less than 10 m (33 ft) in diameter.