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say it: SIG-moyd
sigmoid is an adjective meaning "curved in two directions (like the letter S)". It carries 2 recorded senses.
curved in two directions (like the letter S)
of or relating to the sigmoid flexure in the large intestine
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for sigmoid come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.