scallion scallion /ˈskæljən/

noun

1. [ N. American, Irish] A young onion before the bulb has enlarged; eaten in salads  ( green onion [ N. American] , scallion [ N. American, Irish] , spring onion [British] )
   a young onion before the bulb has enlarged; eaten in salads
    I used chopped spring onions to top my baked potato for a tasty garnish
   I used chopped spring onions to top my baked potato for a tasty garnish
   
   
2. [ N. American, Irish] Plant having a large slender white bulb and flat overlapping dark green leaves; used in cooking; believed derived from the wild Allium ampeloprasum  ( Allium porrum , leek , scallion [ N. American, Irish] )
   plant having a large slender white bulb and flat overlapping dark green leaves; used in cooking; believed derived from the wild Allium ampeloprasum