| NOUN | attribute | semidiameter | the apparent radius of a celestial body when viewed as a disc from the earth |
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| Meaning | The apparent radius of a celestial body when viewed as a disc from the earth. | |
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| Broader | radius, r | The length of a line segment between the center and circumference of a circle or sphere |
| Spanish | semidiámetro | |
| Catalan | semidiámetro | |
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