IPA: /sɪɡˌmɔɪdəˈskɒpɪk/
KK: /sɪɡˌmɔɪdəˈskɑpɪk/
Related to a medical examination of the lower part of the large intestine using a special instrument.
The doctor recommended a sigmoidoscopic examination to check for any abnormalities in the colon.
Sigmoidoscopic → It is formed from "sigmoid" (from Greek "sigmoides", meaning S-shaped) and "-scopic" (from Greek "skopein", meaning to look or examine). The word refers to the examination of the S-shaped part of the colon.
Think of the S-shaped curve ('sigmoid') that is being 'looked at' or 'examined' ('-scopic') — that's what sigmoidoscopic means.
No commonly confused words.