say it: DEK-oh
deco is a noun meaning "a style of design that was popular in the 1920s and 1930s; marked by stylized forms and geometric designs adapted to mass production". It carries one recorded sense.
a style of design that was popular in the 1920s and 1930s; marked by stylized forms and geometric designs adapted to mass production
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 deco 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.