loggerhead

/ˈlɔːɡərˌhɛd/
noun
  1. A foolish or stubborn person; a blockhead.
    • The old loggerhead refused to change his mind about the route.
    • Don't be such a loggerhead; listen to reason for once.
    • She called him a loggerhead after he made the same mistake again.
  2. A large, heavy-headed turtle found in warm seas, especially the loggerhead turtle.
    • Loggerheads are known for their powerful jaws and large heads.
    • The aquarium has a rescue program for injured loggerheads.
    • A loggerhead was spotted nesting on the beach last night.
  3. A tool consisting of a long iron rod with a bulbous end, heated for melting pitch or tar.
    • He carefully placed the loggerhead in the fire until it glowed red.
    • In the old shipyard, a loggerhead was essential for caulking.
    • The sailor used a loggerhead to heat the tar for sealing the deck.
Antonyms
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