British spelling variant of 'ferreled,' meaning fitted with a metal ring or cap for reinforcement.
The British English spelling variant using double-'l' before the past tense suffix '-ed,' following British conventions for consonant doubling (compare 'traveller' vs. American 'traveler').
The difference between 'ferreled' and 'ferrelled' is purely geographical—British English likes to double consonants before adding suffixes, which is why you see this pattern across hundreds of words like 'cancelled' and 'counselled' on opposite sides of the Atlantic.
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