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Noun: celoma  sel-ow-mu
Usage: US, non-standard
  1. (embryology) a fluid-filled cavity that develops in the mesoderm of embryos, giving rise to the pleural, pericardial, and peritoneal cavities in humans
    "The development of the celoma is a key event in embryogenesis";
    - celom [US], coelom

Type of: bodily cavity, cavity, cavum