| crown-rump length | In utero measurement corresponding to the sitting height (crown to rump) of the foetus. Length is considered a more accurate criterion of the age of the foetus than is the weight. The average crown-rump length of the foetus at term is 36 cm. (12 Dec 1998) |
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| crowning | 1. Preparation of the natural crown of a tooth and covering the prepared crown with a veneer of suitable dental material (gold or non-precious metal casting, porcelain, plastic, or combinations). 2. That stage of childbirth when the foetal head has negotiated the pelvic outlet and the largest diameter of the head is encircled by the vulvar ring. (05 Mar 2000) |
| crowns | A prosthetic restoration that reproduces the entire surface anatomy of the visible natural crown of a tooth. It may be partial (covering three or more surfaces of a tooth) or complete (covering all surfaces). It is made of gold or other metal, porcelain, or resin. (12 Dec 1998) |