| 释义 | DictionarySeeCrEncyclopediaSeeCR crown-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 |