semiarch

[ sem-ee-ahrch, sem-ahy- ]
/ ˈsɛm iˌɑrtʃ, ˈsɛm aɪ- /

noun

a half arch.

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Origin of semiarch

First recorded in 1815–25; semi- + arch1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020