A horizontal rail or beam that crosses from one side to another, often used in construction, railroads, or furniture to provide structural support.
Compound of 'cross' (from Old French, meaning to go across) and 'rail' (from Old French 'reille,' meaning iron rod). This modern compound emerged in the 19th century as railway engineering vocabulary expanded.
The Crossrail project in London is one of the world's most expensive infrastructure projects, and the 'cross' in its name perfectly captures its purpose—it's designed to cross the entire city underground! It shows how old vocabulary gets repurposed for modern mega-projects.
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