sem·i·di·am·e·ter 
(sĕm′ē-dī-ămĭ-tər, sĕm′ī-)
(sĕm′ē-dī-ămĭ-tər, sĕm′ī-)n.
The apparent radius of a celestial body when viewed as a disk from Earth.
| 单词 | semidiameter |
| 释义 | sem·i·di·am·e·ter (sĕm′ē-dī-ămĭ-tər, sĕm′ī-)n. The apparent radius of a celestial body when viewed as a disk from Earth. |
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