noun
fido
noun
1
In coin collecting: a coin that was struck incorrectly at the mint, making it unusual and often more valuable to collectors.
"The dealer paid extra for the fido because of its off-center strike."
How to Use Fido
Learner’s notesIn plain EnglishA mis-struck or flawed coin that collectors prize precisely because of its defect.
Memory tip
This is a niche numismatics term, not the classic dog name — context makes the difference clear.
Trace the full origin ↓Word Forms
fidos plural
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The dealer paid extra for the _____ because of its off-center strike.
Etymology
From an acronym for "freaks, irregulars, defects, oddities," coined by coin collectors in the 1960s.