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semidiameter > define

noun

  • The apparent radius of a celestial body when viewed as a disc from the earth. .
by WordNet 3.0 © 2006 by Princeton University
(n.) 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.
by Webster's Revised Unabridged Dictionary