- 1. 1. Of or pertaining to the Allegheny Mountains, or the region where they are situated. Also Al"le*gha`ny. 2. [From the Allegheny River, Pennsylvania.] (Geol.) Pertaining to or designating a subdivision of the Pennsylvanian coal measure. Source: webster
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alleghany
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alleghenypertainingcoaldesignatingmeasuremountainsPennsylvaniaPennsylvanianregionriversituatedsubdivisionthey