Orbitolites
noun
Or·bi·to·li·tes
ˌȯ(r)bətəˈlīt(ˌ)ēz
: a genus of foraminiferans of the Eocene that form thin, broad, circular disks containing numerous small chambers disposed concentrically about a few spirally wound primordial chambers
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Merriam-Webster unabridged
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