Definition of fido
: a coin having a minting error
Recent Examples of fido from the Web
So, please feel free to download and build your own FIDO monitor.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fido.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of fido
freaks + irregulars + defects + oddities
First Known Use: 1967See Words from the same year
Seen and Heard
What made you want to look up fido? Please tell us where you read or heard it (including the quote, if possible).