|Origin:||marcheant, from Latin mercatus, past participle of mercari 'to buy and sell'|
someone whose job is to buy and sell wine, coal etc or a small company that does this:
He had a job with an Edinburgh wine merchant.
someone who buys and sells goods in large quantities:
the son of a wealthy merchant
3 British English informal
someone who is involved in a particular activity, such as tricking people or driving very fast