semidiameter

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English[edit]

Etymology[edit]

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

Noun[edit]

semidiameter (plural semidiameters)

  1. (astronomy) The apparent radius of a star etc, when viewed from Earth.
  2. (archaic) A radius: half of a diameter.

Derived terms[edit]