semidiameter
/ˌsɛmiˈdaɪæmɪtər/
noun
- Half of the diameter of a circle or sphere; the radius.
- To find the area, first measure the semidiameter of the sphere.
- In astronomy, the semidiameter of the moon is used to calculate its distance from Earth.
- The semidiameter of the circle is five centimeters.
Synonyms