释义 |
DictionarySeeCrEncyclopediaSeeCRcrown-rump CROWN-RUMP: Ultrasonographic image of a fetus aged 9 weeks and 3 days. The crown-rump length is highlighted.crown-rump (krown′rŭmp′), CRThe axis for measurement of a fetus, from the tip of the head to the tip of the sacrum. See: illustration |