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单词 orthoceras
释义 or·thoc·er·as
\ȯ(r)ˈthäsərəs\ noun
Usage: capitalized
Etymology: New Latin, from orth- + -ceras
: 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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