| 单词 | placenta |
| 释义 | placenta n. (pl. placentae or placentas) 1. a flattened circular organ in the uterus of pregnant mammals nourishing and maintaining the foetus through the umbilical cord and expelled after birth. 2. (in flowers) part of the ovary wall carrying the ovules. Derivatives placental adj. Etymology: L f. Gk plakous -ountos flat cake f. the root of plax plakos flat plate |
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