adj.
Pronunciation: ' sig- ˌ mo ̇ id
Variant: also sig · moi · dal \ sig- ' mo ̇ i-d ə l \
Function: adjective
Etymology: Greek sigmoeid ē s, from sigma; from a common form of sigma shaped like the Roman letter C
Date: 1670
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
– sig · moi · dal · ly \ sig- ' mo ̇ i-d ə l- ē \ adverb