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semidiameter n. 半徑 半徑 semidiameter n 1: the apparent radius of a celestial body when viewed as a disc from the earth Semidiameter \Sem`i*di*am"e*ter\, n. (Math.)
Half of a diameter; a right line, or the length of a right line, drawn from the center of a circle, a sphere, or other curved figure, to its circumference or periphery; a radius. [1913 Webster]
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