IPA: //ˈsteɪn.ləs//
KK: /ˈsteɪnləs/
Made from a material that does not easily get stained or corroded, often used for kitchenware and appliances.
The chef preferred to use a stainless steel pot for cooking.
Stainless → It is formed from "stain" (from Old French *esteindre*, meaning to extinguish or to stain) and "-less" (meaning without). The word "stainless" means without stains or blemishes, particularly in reference to materials that do not tarnish or corrode.
Think of something that is 'without' ('-less') any 'stains' — that's why stainless means it has no stains.