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semiarch

[sem-ee-ahrch, sem-ahy-] /ˈsɛm iˌɑrtʃ, ˈsɛm aɪ-/
noun
1.
a half arch.
Origin of semiarch
1815-1825
1815-25; semi- + arch1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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