A half-tube shape or structure; a cylindrical form cut lengthwise in half.
From 'demi-' (half) plus 'tube' (from Latin 'tubus'). A geometric and architectural term used since the 17th century.
Demitubes are hidden in engineering everywhere—half-pipe skateboard ramps, Quonset huts, and culvert pipes all use this half-cylinder shape because it's structurally strong yet economical to build!
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