From Longman Dictionary of Contemporary EnglishBrussels sproutBrus‧sels sprout /ˌbrʌsəlz ˈspraʊt/ noun [countable] 
DFFHBPa small round green vegetable that looks like a very small cabbage
DFFHBPa small round green vegetable that looks like a very small cabbageExamples from the Corpus
Brussels sprout• We were going to have an 80-foot Brussels sprout flying above Battersea Power Station - and it nearly happened!• Lettuce is particularly good for intercropping among young Brussels sprout and broccoli plants.Origin brussels sprout (1600-1700) Brussels, where it was first grown 