A small arch; a little or minor arch, especially an ornamental or decorative arch in architecture.
From 'arch' combined with the diminutive suffix '-let' (meaning small, little), similar to 'booklet' or 'ring let'. The '-let' suffix makes architecture terms specifically mean smaller versions.
The '-let' suffix is adorable in architectural vocabulary—an 'archlet' is to an arch what a 'chapel' is to a cathedral, and English speakers used this pattern to create a whole vocabulary for smaller versions of larger structures without needing completely new words.
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