pin-head

noun

1. 1

   The head of a pin. (Frequently used in size comparisons.)

2. 2

   An ignorant, naive, foolish, or stupid person.

3. 3

   A telemark skier.

4. 4

   A human head that is unusually tapered or small, often due to microcephaly, or a person with that trait. Often promoted in freak shows as "human pinheads".

5. 5

   (pet stores) A newborn cricket used as food for pets.

6. 6

   (mycoculture) The immature juvenile fruiting body of a mushroom prior to its gills opening.