What's the difference between: 耳膜 and 鼓膜?
Apparently they both check out to eardrum in English.
汉语大辞典, even, defines 耳膜 as
Can 鼓膜 be used in other places then?
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The dictionary takes extra caution and says it's the membrane in the ear, because 鼓膜 literally means "drum membrane", which might be taken by someone as the membrane on a real drum.
In real usage, however, 鼓膜 is just the eardrum. The membrane on a drum instrument, or the drum head, is called 鼓皮.