Acanthodii
plural noun
Ac·an·tho·dii
| \ ˌaˌkanˈthōdēˌī, ˌakən- \
Definition of Acanthodii
: a subclass of Placodermi comprising primitive Paleozoic fishes having the anterior margin of each fin supported by a stout spine and often having one or more pairs of spines similar to the fin spines along the lower lateral part of the body between the paired fins of each side
Test Your Vocabulary
Which Word Does Not Belong?
-
- Which of these words does not mean "nonsense"?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share Acanthodii
Time Traveler for Acanthodii
The first known use of Acanthodii was in 1851
See more words from the same year