From Longman Dictionary of Contemporary Englishleekleek /liːk/ noun [countable] 
HBPDFFa vegetable with a long white stem and long flat green leaves, which tastes like an onion
HBPDFFa vegetable with a long white stem and long flat green leaves, which tastes like an onionExamples from the Corpus
leek• Add leek shreds, parsley, spinach and remaining cider to pan, cover and cook for a further four minutes.• Add leeks and saute slowly until they just begin to colon Add carrot and celery and saute for 3 minutes longer.• Leeks: choose thin, firm clean leeks.• For Neil Kinnock, a dish of leeks baked in Caerphilly sauce - easy to eat and comforting whatever the outcome.• Add carrot, onion, leeks, celery, and garlic and continue to saute until lightly browned.• For a first course, there is a potato leek soup.• Cut remaining leek greens into fine shreds.• Remove leeks and oysters from skillet and set aside.Origin leek Old English leac 