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Answer for the clue "A cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity ", 6 letters:
coelom

Word definitions for coelom in dictionaries

Wikipedia Word definitions in Wikipedia
The coelom ( , plural coeloms or coelomata ) (Greek koilōma , hollow, cavity) refers to the main body cavity in most multicellular animals and is positioned inside the body to surround and contain the digestive tract and other organs. In developed animals ...

Wiktionary Word definitions in Wiktionary
n. (context zoology English) A fluid-filled cavity within the body of an animal. The digestive system is suspended within the cavity, which is lined by a tissue called the peritoneum.

WordNet Word definitions in WordNet
n. a cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity [syn: celom , celoma ]