semidiameter

semidiameter

[sem-ee-dahy-am-i-ter, sem-ahy-]
noun
half of a diameter; radius.

Origin:
1545–55; semi- + diameter

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
semidiameter

noun
the apparent radius of a celestial body when viewed as a disc from the earth 
WordNet® 3.0, © 2006 by Princeton University.
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