A blockhead; a dunce; a numskull.
- A loggerhead turtle.
- An iron tool consisting of a long handle with a bulbous end, used when heated to melt tar or warm liquids.
- Nautical A post on a whaleboat used to secure the harpoon rope.
- Informal A blockhead; a dolt.
- Informal A disproportionately large head.
- at loggerheads Engaged in a dispute: The question of car privileges put Sam and his parents at loggerheads.