loggerhead

noun

1. 1

   A stupid person; a blockhead, a dolt.

2. 2

   A metal tool consisting of a long rod with a bulbous end that is made hot in a fire, then plunged into some material (such as pitch or a liquid) to melt or heat it.

3. 3

   A post on a whaling boat used to secure the harpoon rope.

4. 4

   (often in the plural) A thistle-like flowering plant of the genus Centaurea, particularly the common knapweed (Centaurea nigra).

5. 5

   Used as the name of various animals with large heads.