semidiameter

noun
semi·​di·​am·​e·​ter | \ˌse-mē-dī-ˈa-mə-tər, ˌse-ˌmī-, -mi-\

Definition of semidiameter 

: radius specifically : the apparent radius of a generally spherical celestial body

First Known Use of semidiameter

14th century, in the meaning defined above

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The first known use of semidiameter was in the 14th century

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