A hemocoel is a cavity or series of spaces between the organs of organisms with open circulatory systems, like most arthropods and mollusks. A combination of blood, lymph, and interstitial fluid called hemolymph circulates through the hemocoel.
The term is also used to describe the space in the connective tissue compartment derived from the embryonic blastocoel with contributions from mesoderm, filled with blood.
haemocoel in Italian: Emocele
haemocoel in Ukrainian: Гемоцель