sigmoid
UK[ˈsɪɡmɔɪd]US[ˈsɪɡmɔɪd]
adj
shaped like the letter s or the greek letter sigma
adj
of or relating to the sigmoid colon, the s-shaped last part of the large intestine
Morpheme Breakdown
sigm
oid
sigm
sigma
oid
resembling
Etymology
the word 'sigmoid' is a modern scientific term formed directly from greek components. it combines 'sigma', the name of the 18th letter of the greek alphabet (Σ), which has a distinctive curved or s-shaped form, with the adjectival suffix '-oid', derived from greek '-oeidēs', meaning 'like' or 'resembling'. the term was coined to describe any anatomical structure, mathematical curve, or object that exhibits the characteristic double-curve shape of the letter s or the greek sigma. its application is most established in anatomy, specifically for the sigmoid colon, due to that intestinal segment's pronounced s-shaped bend.
Analysis
Structure: sigm (sigma) + oid (resembling)
sigm (from greek letter name 'sigma', Σ/σ/ς) + oid (from greek suffix '-oeidēs', meaning 'having the form of, resembling')
Examples
the sigmoid curve is commonly used in statistics to model growth processes.
the patient underwent surgery to remove a polyp from the sigmoid colon.
the river took a sigmoid path through the valley, creating a series of gentle bends.