noggin

Short definition from Wiktionary

Noun

1. 1
   A small mug, cup or ladle; the contents of such a container.
2. 2
   A small measure of spirits equivalent to a gill.
3. 3
   The head.
4. 4
   A signalling molecule involved in embryo development, producing large heads at high concentrations.
5. 5
   Alternative form of nogging (“horizontal beam; rough brick masonry”).