Plural of dreadnaught; multiple heavily armored battleships, or in general use, powerful, fearless entities.
From dreadnaught + -s (plural marker). Dreadnaught itself comes from dread + naught (nothing).
The British Navy named one ship 'Dreadnought' so powerful that the enemy's entire naval strategy changed—the word became so iconic that multiple nations built dozens of 'dreadnoughts,' making it one of few common nouns derived from a single ship's name.
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