SINCE 1828
Protobranchia
plural noun
Pro·to·branchia
Definition of Protobranchia
: an order of Lamellibranchia comprising primitive bivalve mollusks in which the gills consist of a double row of simple lamellae not reflected or united
Keep scrolling for more
Comments on Protobranchia
What made you want to look up Protobranchia? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Original Meanings Quiz
-
- Which of the following is the earliest known sense of the word awe?
Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
-
Original Meanings Quiz
A quiz for the pedantic and those annoyed by them!
Take the quiz -
A Green Quiz
How many questions can you answer about the word "green"?
Take the quiz -
True or False?
Test your knowledge - and maybe learn something along the way.
Take the quiz -
Word Winder's CrossWinder
Play the game
Share Protobranchia
Resources for Protobranchia