Poppet

n.
  1. See Puppet.
  2. (Naut.) One of certain upright timbers on the bilge ways, used to support a vessel in launching.
  3. (Mach.) An upright support or guide fastened at the bottom only.
  4. same as poppit.
  5. Poppet head, Puppet head .
    See Headstock (a).