Perischoechinoida
plural nounPe·ris·cho·ech·i·noi·da | \ pə¦ris(ˌ)kōˌekəˈnȯidə \
Definition of Perischoechinoida
: a large order of regular Paleozoic Echinoidea
Keep scrolling for more
Test Your Vocabulary
Slippery Words Quiz—Changing with the Times
- What is an earlier meaning of nice?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
Spell words. Make bears.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
Share Perischoechinoida