[law-ger-hed, log-er-]
a thick-headed or stupid person; blockhead.
a ball or bulb of iron with a long handle, used, after being heated, to melt tar, heat liquids, etc.
a rounded post, in the stern of a whaleboat, around which the harpoon line is passed.
a circular inkwell having a broad, flat base.
at loggerheads, engaged in a disagreement or dispute; quarreling: They were at loggerheads over the distribution of funds.

1580–90; logger block of wood (first attested alone in 18th century) + head

loggerheaded, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
loggerhead (ˈlɒɡəˌhɛd)
1.  Also called: loggerhead turtle a large-headed turtle, Caretta caretta, occurring in most seas: family Chelonidae
2.  loggerhead shrike a North American shrike, Lanius ludovicianus, having a grey head and body, black-and-white wings and tail, and black facial stripe
3.  a tool consisting of a large metal sphere attached to a long handle, used for warming liquids, melting tar, etc
4.  a strong round upright post in a whaleboat for belaying the line of a harpoon
5.  archaic, dialect or a blockhead; dunce
6.  at loggerheads engaged in dispute or confrontation
[C16: probably from dialect logger wooden block + head]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1588, "stupid person, blockhead," from dial. logger "heavy block of wood." Later it meant "a thick-headed iron tool" (1687), a type of cannon shot, a type of turtle (1657). Loggerheads "fighting, fisticuffs" is from 1680, but the exact notion is uncertain, perhaps it suggests the heavy tools used as
weapons. The phrase at loggerheads "in disagreement" is first recorded 1831.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Loggerhead turtles nest on beaches where footprints are harder to find than
  shark's teeth.
Excursions are available to take you crabbing or to a loggerhead turtle
Northern mockingbirds, blue grosbeaks and loggerhead shrike nest nearby.
Watch for the loggerhead sea turtles that sometimes nest on the refuge.
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