topical

Short definition from Wiktionary

Adjective

1. 1
   Relating to a particular topic or subject.
2. 2
   Relating to a topic or subject of current interest.
3. 3
   Local to a particular place.
4. 4
   Applied to a localized part of the body.
5. 5
   Applied externally (to the surface of the skin or eye).
6. 6
   Arranged according to topic or theme; thematic.

Noun

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