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semidiameter
The Collaborative International Dictionary
Semidiameter

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.

Wiktionary
semidiameter

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

WordNet
semidiameter

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

Wikipedia
Semidiameter

In geometry, the semidiameter or semi-diameter of a set of points may be one half of its diameter; or, sometimes, one half of its extent along a particular direction.

Usage examples of "semidiameter".

And no mean Observations hereof there is in the Mathematicks of the neatest Retiary Spider, which concluding in fourty-four Circles, from five Semidiameters beginneth that elegant texture.