Adjacent Words

semidiameter definitions

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WordNet (r) 3.0 (2005)

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

Merriam Webster's

noun Date: 14th century radius; specifically the apparent radius of a generally spherical celestial body

Oxford Reference Dictionary

n. half of a diameter. Etymology: LL (as SEMI-, DIAMETER)

Webster's 1913 Dictionary

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.