Agnostus

noun
Ag·nos·tus | \ag-ˈnä-stəs\

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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First Known Use of Agnostus

1824, in the meaning defined above

History and Etymology for Agnostus

borrowed from New Latin, borrowed from Greek ágnōstos “unknown”

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The first known use of Agnostus was in 1824

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