from The Century Dictionary and Cyclopedia

  • n. A genus of Devonian echinoids or sea-urchins which belong to the family Archæocidaridæ, characterized by 5 to 11 columns of interam-bulacral plates and very narrow ambulacra which continue beyond the peristomial margin to the true mouth.


Sorry, no etymologies found.


Sorry, no example sentences found.

Wordnik is becoming a not-for-profit! Read our announcement here.


Log in or sign up to get involved in the conversation. It's quick and easy.