peewees

1. any of a number of birds with a call that resembles the word ‘peewee’.
2. a level of amateur sport, involving children aged eight or nine (in the US) or twelve or thirteen (in Canada).

   a peewee baseball team

3. a small marble.

mid 19th century (in peewee (sense 3 of the noun)); peewee (sense 1 of the noun) is imitative; peewee (sense 2 of the noun, sense 3 of the noun) are from wee¹, by reduplication.

plural noun

a North American tyrant flycatcher with dark olive-grey plumage.

late 18th century: imitative.