Rapeseed, (Brassica napus, variety napus), plant of the mustard family (Brassicaceae) grown for its seeds, which yield canola, or rapeseed, oil. Canola oil is variously used in cooking, as an ingredient in soap and margarine, and as a lamp fuel (colza oil). The esterified form of the oil is used as a lubricant for jet engines and can be made into biodiesel. The seeds are also used as bird feed, and the seed residue after...