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semidiameter

[sem-ee-dahy-am-i-ter, sem-ahy-] /ˌsɛm i daɪˈæm ɪ tər, ˌsɛm aɪ-/
noun
1.
half of a diameter; radius.
Origin
1545-1555
1545-55; semi- + diameter
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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