口腔 kǒuqiāng oral cavity
How to remember 口腔: 口 mouth (Kangxi radical 30) + 腔 chest cavity = oral cavity.
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How it is used
- The oral cavity as an anatomical/medical term - 口腔卫生 (kǒuqiāng wèishēng) oral hygiene, 口腔医院 dental hospital.
- Not the everyday word for 'mouth' (that's 嘴 or 嘴巴) - 口腔 belongs to health and dentistry contexts.