To save this word, you'll need to log in.
Medical Definition of pyloric sphincter
: the circular fold of mucous membrane containing a ring of circularly disposed muscle fibers that closes the vertebrate pylorus
— called also pyloric valve
Comments on pyloric sphincter
What made you want to look up pyloric sphincter? 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?
Can you spell these 10 commonly misspelled words?
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
Share pyloric sphincter