The Collaborative International Dictionary
Eozoon
Eozoon \E`o*zo"["o]n\, n.; pl. Eozo["o]ns, L. Eozoa. [NL., fr. Gr. 'hw`s dawn + zw^,on an animal.] (Paleon.) A peculiar structure found in the Arch[ae]an limestones of Canada and other regions. By some geologists it is believed to be a species of gigantic Foraminifera, but others consider it a concretion, without organic structure.
Wiktionary
eozoon
n. (alternative form of eozoön English)
eozoön
alt. (context paleontology dated English) A pseudofossil with banded structures of coarsely crystalline calcite and serpentine. n. (context paleontology dated English) A pseudofossil with banded structures of coarsely crystalline calcite and serpentine.