sigmoid

play
adjective sig·moid \ ˈsig-ˌmȯid \
variants: or less commonly sigmoidal play \sig-ˈmȯi-dᵊl\

Definition of sigmoid

1 a :curved like the letter C
b :curved in two directions like the letter S
2 :of, relating to, or being the sigmoid colon

sigmoidally

play \sig-ˈmȯi-dᵊl-ē\ adverb

sigmoid was our Word of the Day on 10/05/2010. Hear the podcast!

Did You Know?

The shape sense of sigmoid is most often used in scientific contexts to describe an s-shaped curve on a graph. Usually, though, sigmoid is used in contexts relating to the sigmoid colon-the contracted and crooked part of the colon immediately above the rectum. Sigmoid comes from sigma, the name of the 18th letter of the Greek alphabet. At one time sigma had a common form that was shaped like the Roman letter C (hence sense 1a), but sigma is equivalent to the English letter S (hence sense 1b).

Origin and Etymology of sigmoid

Greek sigmoeidēs, from sigma; from a common form of sigma shaped like the Roman letter C


Medical Dictionary

1

sigmoid

play
adjective sig·moid \ ˈsig-ˌmȯid \

medical Definition of sigmoid

1 a :curved like the letter C
b :curved in two directions like the letter S
2 :of, relating to, or being the sigmoid colon of the intestine
  • sigmoid lesions

2

sigmoid

noun

medical Definition of sigmoid


Learn More about sigmoid


Seen and Heard

What made you want to look up sigmoid? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

a ram's-horn trumpet used in Judaism

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!