log·ger·head 
(lôgər-hĕd′, lŏgər-)
(lôgər-hĕd′, lŏgər-)n.
Idiom: 1. A loggerhead turtle.
2. An iron tool consisting of a long handle with a bulbous end, used when heated to melt tar or warm liquids.
3. Nautical A post on a whaleboat used to secure the harpoon rope.
4. Informal A blockhead; a dolt.
at loggerheads
Engaged in a dispute: The question of car privileges put Sam and his parents at loggerheads.
[Probably dialectal logger, wooden block (probably from LOG1) + HEAD.]
- Hypatia
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