The Chinese word **口腔 (kǒuqiāng)**, meaning "oral cavity," is a logical compound formed by combining two characters: **口 (kǒu)**, which means "mouth" or "opening," and **腔 (qiāng)**, which means "cavity," "chamber," or "hollow space." This follows the common Chinese word-formation principle where two semantically related characters are joined to create a precise, descriptive term—in this case, specifying the anatomical cavity of the mouth itself. The term is thus semantically transparent, directly describing the physical structure as the "mouth cavity."