Loggerhead /(?)/

Log·ger·head

Loggerhead

n.
  1. A blockhead; a dunce; a numskull.
  2. A spherical mass of iron, with a long handle, used to heat tar.
  3. 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. (Naut.)
  4. 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. (Zool.)
  5. An American shrike (Lanius Ludovicianus), similar to the butcher bird, but smaller. See Shrike. (Zool.)

Phrases & Compounds
To be at loggerheads
to quarrel; to be at strife.