leek n.

pungent bulbous culinary herb of the genus Allium, related to the onion, long the national badge of the Welsh, Old English læc (Mercian), leac (West Saxon) "leek, onion, garlic," from Proto-Germanic *lauka- (source also of Old Norse laukr "leek, garlic," Danish løg, Swedish lök "onion," Old Saxon lok "leek," Middle Dutch looc, Dutch look "leek, garlic," Old High German louh, German Lauch "leek"). No certain cognates outside Germanic; Finnish laukka, Russian luk-, Old Church Slavonic luku are said to be from Germanic. Also the final element in garlic.