'Semidiameter' definitions:

Definition of 'semidiameter'

(from WordNet)

noun

The apparent radius of a celestial body when viewed as a disc from the earth

Definition of 'Semidiameter'

From: GCIDE

Semidiameter \Sem`i*di*am"e*ter\, n. (Math.) Half of a diameter; a right line, or the length of a right line, drawn from the center of a circle, a sphere, or other curved figure, to its circumference or periphery; a radius. [1913 Webster]

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