loggerhead

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A loggerhead turtle.
• noun An iron tool consisting of a long handle with a bulbous end, used when heated to melt tar or warm liquids.
• noun Nautical A post on a whaleboat used to secure the harpoon rope.
• noun Informal A blockhead; a dolt.
• idiom (at loggerheads) Engaged in a dispute.

from The Century Dictionary.

• noun A blockhead; a dunce; a dolt; a thickskull.
• noun A spherical mass of iron with a long handle, used after being heated for various purposes, as to liquefy tar, to ignite the priming of a cannon, etc. Also called loggerheat.
• noun A post in the stern of a whale-boat, with a bell-shaped head, around which the harpoon-line passes; a snubbing-post.
• noun The hawk-billed turtle, a marine species of the genus Thalassochelys, as the American loggerhead, T. caouana or caretta, or the Indian, T. olivacea; also, the alligator-turtle of the southern United States, Macrochelys lacertina.
• noun The small gray or Carolinian shrike, Lanius ludovicianus, a bird of the family Laniidæ, resident and abundant in the southern parts of the United States, and sometimes as far north as New England.
• noun A flycatcher.
• noun The chub.
• noun A kind of sponge found in Florida.
• noun plural The knapweed, Centaurea nigra; also, the blue-bottle, C. Cyanus.
• noun In the southern United States, the common snapping-turtle, Chelydra serpentina.
• noun Specifically— in the British West Indies, a name applied to two large tyrant flycatchers, Pitangus caudifas-ciatus, and Myiarchus crinitus.
• noun The steamer-duck, Tachyeres cinereus, a flightless water-fowl of the Falkland Islands and Straits of Magellan.
• noun A lever or walking-beam which connects the piston-rod of an engine to the pump-plunger.
• noun A pewter inkstand, circular and very heavy.
• noun A large, heavy head, out of proportion to the body.

from the GNU version of the Collaborative International Dictionary of English.

• noun A blockhead; a dunce; a numskull.
• noun A spherical mass of iron, with a long handle, used to heat tar.
• noun (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.
• noun (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.
• noun (Zoöl.) An American shrike (Lanius Ludovicianus), similar to the butcher bird, but smaller. See Shrike.
• noun to quarrel; to be at strife.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a tool consisting of a rod with a bulbous end, used once made hot in a fire for the purpose of heating liquids that it is plunged into.
• noun nautical A post on a whaling boat used to secure the harpoon rope
• noun the loggerhead turtle
• noun the loggerhead shrike
• noun informal A dolt or blockhead

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun very large carnivorous sea turtle; wide-ranging in warm open seas
• noun a stupid person; these words are used to express a low opinion of someone's intelligence