say it: TIM-puh-nuhm
tympanum is a noun meaning "the main cavity of the ear; between the eardrum and the inner ear". It carries 3 recorded senses.
the main cavity of the ear; between the eardrum and the inner ear
the membrane in the ear that vibrates to sound
a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it
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 tympanum 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.