Loggerhead

n.
  1. A blockhead; a dunce; a numskull.
  2. A spherical mass of iron, with a long handle, used to heat tar.
  3. (Naut.) An upright piece of round timber, in a whaleboat, over which a turn of the line is taken when it is running out too fast.
  4. (Zoöl.) A very large marine turtle (Thalassochelys caretta syn. Thalassochelys caouana), common in the warmer parts of the Atlantic Ocean, from Brazil to Cape Cod; -- called also logger-headed turtle.
  5. (Zoöl.) An American shrike (Lanius Ludovicianus), similar to the butcher bird, but smaller. See Shrike.
    6. To be at loggerheads, To fall to loggerheads, or To go to loggerheads ,
    to quarrel; to be at strife.