A horizontal spar or pole attached to a ship's mast, located forward of the main boom, used to extend a sail.
Nautical compound: 'fore-' (forward) + 'boom' (from Middle Dutch 'boom' meaning tree or pole). This specific rigging term emerged in sailing terminology around the 17th century.
Old sailing ships needed multiple booms to control different sails, and their precise names—foreboom, main boom, spanker boom—told you exactly which part of the rigging they controlled. Ship captains could issue orders using just these names in the chaos of a storm.
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