SEMIDIAMETER

semidiameter

(noun) the apparent radius of a celestial body when viewed as a disc from the earth

Source: WordNet® 3.1

Etymology

Noun

semidiameter (plural semidiameters)

(astronomy) The apparent radius of a star etc, when viewed from Earth.

(archaic) A radius: half of a diameter.

Source: Wiktionary

Sem`i*di*am"e*ter, n. (Math.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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