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say it: IN-duh-goh
indigo is a noun and adjective meaning "a blue dye obtained from plants or made synthetically". It is pronounced /ˈɪndəˌɡoʊ/ — IN-duh-goh. It carries 4 recorded senses.
deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye
a blue-violet color
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 indigo 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.