A scallion, green onion, or spring onion, is one of various Allium species, all of which have hollow green leaves (like the common onion), but which lack a fully developed root bulb. Harvested for their taste, scallions are milder than most onions. Used as a vegetable, it is eaten either raw or cooked.While scallion is a term that is understandable to most English speakers, there are other names associated with the onion including the aforementioned ones. Other names such as salad onion, table onion, green shallot, onion stick, long onion, baby onion, precious onion, yard onion, gibbon, syboe, or scally onion, may also be used.