tym·pa·num also tim·pa·num (tĭm’pə-nəm) n. pl. tym·pa·na also tim·pa·na (-nə) or tym·pa·nums also tim·pa·nums
||the recessed, usually triangular space enclosed between the horizontal and sloping cornices of a pediment, often decorated with sculpture.
||a similar space between an arch and the horizontal head of a door or window below.
||Electricity. the diaphragm of a telephone.
||a drum or similar instrument.
||the stretched membrane forming a drumhead.
[Origin: 1610–20; < L < Gk týmpanon drum, akin to týptein to beat, strike]