Well of of course you should treat Wikipedia with caution but that is not to say it is extremely useful source of information especially when corroborated by other perhaps more reliable sources.
The meaning of a word is of course established by current usage , not what any person in particular thinks it should mean, what you want it to mean or indeed what it used to mean. Thus to establish the usage of and meaning of a word you need to look at multiple different sources including dictionaries and usages in various media and day to day speech and business.
For better or worse by those criteria a wing mirror is now simply a mirror on the side of a car.
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