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Orthoceras
noun
Or·thoc·er·as
\ȯ(r)ˈthäsərəs\
Definition of Orthoceras
: an ill-defined genus of extinct nautiloid cephalopod mollusks having a long tapering shell that is nearly or quite straight, almost smooth, and many-chambered
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Origin and Etymology of orthoceras
New Latin, from orth- + -ceras
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