Definition of semidiameter in English:


Syllabification: sem·i·di·am·e·ter
Pronunciation: /ˌsemēdīˈamitər, ˌsemˌī-


Astronomy & Geometry
Half of a diameter; radius.
More example sentences
  • 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.


late Middle English: from late Latin.

Definition of semidiameter in:

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be of the opinion; think or suppose