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Semidiameter

noun

Definitions

Noun
  1. 1
    The apparent radius of a star etc, when viewed from Earth.
  2. 2
    the apparent radius of a celestial body when viewed as a disc from the earth wordnet
  3. 3
    A radius: half of a diameter. archaic

    "[B]etweene the ſphere of Saturne and the Firmament, there is ſuch an incredible and vaſt ſpace or diſtance (7000000. ſemidiameters of the earth, as Tycho [Brahe] calculates) void of ſtarres: [...]"

Etymology

From Middle English semidiametre, semydiametre, from Medieval Latin sēmidiameter, equivalent to semi- + diameter.

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