Endoceras

noun

En·​doc·​er·​as

enˈdäsərəs

: a genus (the type of the family Endoceratidae) of Ordovician and Silurian nautiloid cephalopods with a straight shell having a very large siphuncle and endocones and reaching a length of 12 feet

endoceratid

¦endō¦serətə̇d

adjective or noun

Word History

Etymology

New Latin, from end- + -ceras

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