An alternative singular form of exocoelom; the cavity or space external to the main body cavity in certain animals.
From Latin-Greek combining form using 'exo-' and 'coelum' (the Latinized form of 'coelom'), following scientific nomenclature practices that sometimes Latinize Greek terms.
The distinction between exocoelom and exocoelum shows how scientific terminology often evolves with both Latin and Greek plurals—scientists sometimes can't agree on which language rules to follow!
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