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.
4. (Science: zoology) a very large marine turtle (Thalassochelys caretta, or caouana), common in the warmer parts of the atlantic ocean, from Brazil to Cape Cod; called also logger-headed turtle.
5. (Science: zoology) An American shrike (Lanius Ludovicianus), similar to the butcher bird, but smaller. See shrike. To be at loggerheads, to fall to loggerheads, or to go to loggerheads, to quarrel; to be at strife.
Origin: log – head.