"hari" & viSNu

[Periannan Chandrasekaran]

What does the word "hari" mean when applied to viSNu?

I am unable to find an entry in the  Cologne Capellar's  dictionary
an entry as applicable to visNu.
The dictionary repeatedly lists the sense of "yellow"  for the word
"hari" which does not seem to be related to viSNu directly or
indirectly.
Am I making any trivial mistakes in the search?

Regards,
Chandra
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