say it: aw-ruh-NOH-koh
orinoco is a noun meaning "a South American river 1,500 miles long; flows into the South Atlantic". It carries one recorded sense.
a South American river 1,500 miles long; flows into the South Atlantic
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 orinoco 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.