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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 semi·di·am·e·ter /-daɪˈæmətɚ/
 半徑

From: Webster's Revised Unabridged Dictionary (1913)

 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.
 ◄ ►

From: WordNet (r) 2.0

 semidiameter
      n : the apparent radius of a celestial body when viewed as a
          disc from the earth