Roast potatoes

What is Roast potatoes ?

Roast potatoes is (plural noun) potatoes baked in fat in an oven (NOTE: Although the (verb) has the forms roasting roasted, when referring to meat, the adjective roast is used: roast meat, roast turkey, but roasted peanuts, roasted chestnuts.)

 

source: Easier English, Student Dictionary Upper Intermediate Level