truncheon

Short definition from Wiktionary

Noun

1. 1
   A short staff, a club; a cudgel.
2. 2
   A baton, or military staff of command, now especially the stick carried by a police officer.
3. 3
   A fragment or piece broken off from something, especially a broken-off piece of a spear or lance.
4. 4
   The shaft of a spear.
5. 5
   A stout stem, as of a tree, with the branches lopped off, to produce rapid growth.
6. 6
   A penis.

Verb

1. 1
   To strike with a truncheon.