tympanum

1.【解】耳膜,鼓膜;鼓室,中耳;(电话机的)振动膜;【动】颈侧气囊,鸣腔

2.鼓

3.【建】山墙的三角面部分,门楣中心

4.【机】溜槽水车,鼓形水车

1.a recess, especially the recessed space between the top of a door or window and the arch above it, or between the cornices forming a classical triangular gable

2.the eardrum or the cavity of the middle ear

3.a vibrating membrane in some insects that serves as a hearing organ