order_exocycloida
1. [ noun ] (biology,zoology) flat sea urchins
Synonyms: Exocycloida
Related terms: animal_order Echinoidea sand_dollar
Similar spelling:   order_Octopoda
  order_Coccidia
  order_Chelonia
  order_Crocodilia
  order_Crocodylia
  order_Chelonethida
  order_Psocoptera
  order_Pelycosauria
  order_Ericales
  order_Ephemerida
  order_Orchidales