Plural of crosstree; multiple horizontal supporting spars on a ship's masts.
Regular plural of 'crosstree', formed with '-es'. Used in nautical terminology since at least the 15th century in ship design documents.
Ships often had multiple crosstrees stacked at different heights on a single mast—sailors would scramble up to these platforms to maintain rigging high above deck, making them both structural necessities and dangerous workplaces in the age of sail.
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