trad ‧ er /ˈtreɪdə $ -ər/ BrE AmE noun [countable]
[ Word Family: noun : ↑ trade , ↑ trader , ↑ trading ; verb : ↑ trade ]
someone who buys and sells goods or ↑ stock s ⇨ retailer
small/local trader
a small trader who sells hats in Oxford
bond/currency/commodity etc trader
To the surprise of many Wall Street traders, the dollar rose yesterday.