Definition of Agnostus
: a genus of small blind Cambrian and Ordovician trilobites that with a number of related forms in which the cephalon and pygidium are almost indistinguishable constitute an order (Agnostida) of highly specialized forms
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Origin and Etymology of agnostus
borrowed from New Latin, borrowed from Greek ágnōstos “unknown” — more at 1agnostic
First Known Use: 1824
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