topical

中文： 外用药、局部麻醉剂、专题邮票

1. A substance, especially a medication, applied externally (to the surface of the skin or eye).
2. A topical anaesthetic.
3. A joke dealing with current events or topical subjects.
4. A postage stamp depicting a particular theme or subject (such as birds or trains), potentially sought out by topical stamp collectors.

复数 topicals