Read Edit View history 乳突窦 rǔtūdòu mastoid antrum Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 乳突窦/乳突竇 · rǔtūdòu · mastoid antrum 2026/03/04 乳突窦 / 乳突竇 rǔtūdòu mastoid antrum mastoid antrum (the air space behind the tympanic cavity) 乳突窦是连接中耳鼓室与乳突气室的重要通道。 noun created sense Mar 4, 2026, 02:25 AM