An architectural or structural element that crosses at the tail or rear section of a building or vessel.
Compound of 'cross' (from Latin 'crux') and 'tail' (from Old English 'tægel'). The term developed in nautical and architectural vocabulary to describe perpendicular rear-section reinforcements.
Medieval ship builders used crosstails as critical structural braces in the stern—they prevented the ship's back end from twisting in rough seas, which is why many surviving Viking ship reconstructions show these ingenious X-shaped reinforcements.
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