Definition of gill slit
1
: any of the openings or clefts between the gill arches in vertebrates that breathe by gills through which water taken in at the mouth passes to the exterior and so bathes the gills
2
: any of the rudimentary grooves in the neck region of the embryos of air-breathing vertebrates that correspond to the gill slits
3
: the external opening to the cavity containing the gills when a protective covering of the gills is present
Test Your Vocabulary
Name That Color
-
- Name that color:

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share gill slit
Time Traveler for gill slit
The first known use of gill slit was in 1854
See more words from the same year