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say it: RUHD-ur
rudder is a noun meaning "a hinged vertical airfoil mounted at the tail of an aircraft and used to make horizontal course changes". It is pronounced /ˈɹʌdɚ/ — RUHD-ur. It carries 2 recorded senses.
a hinged vertical airfoil mounted at the tail of an aircraft and used to make horizontal course changes
(nautical) steering mechanism consisting of a hinged vertical plate mounted at the stern of a vessel
seafaring
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 rudder 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.