Definition of semidiameter in English:

semidiameter

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

noun

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.

Origin

late Middle English: from late Latin.

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Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody