Definition of semidiameter in English:
Half of a diameter.
- The moon will, at the full, be totally eclipsed, if its latitude is less than the difference between its own semidiameter, and that of the earth's shadow.
- By the semidiameter of a celestial object, is meant the angle which the radius of its apparent circular disc subtends at the eye of the observer.
Definition of semidiameter in:
- US English dictionary
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