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ridgepole (n.)

also ridge-pole, 1670s, from ridge (n.) + pole (n.1).

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Definitions of ridgepole from WordNet

ridgepole (n.)
a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters;
Synonyms: ridge / rooftree
From wordnet.princeton.edu