large barrel; hogshead; puncheon; foudre
Refers to a large wooden barrel or cask, especially for storing or aging liquids like wine or sake. The English terms 'hogshead', 'puncheon', and 'foudre' denote specific sizes or types used in brewing and winemaking.
At the winery, they age wine in large barrels.
Compound of 大 (おお, 'large') and 樽 (たる, 'barrel'). The reading おおだる follows standard rendaku voicing.