Scallion

from WordNet (r) 3.0 (2006)

scallion
    n 1: plant having a large slender white bulb and flat
         overlapping dark green leaves; used in cooking; believed
         derived from the wild Allium ampeloprasum [syn: {leek},
         {scallion}, {Allium porrum}]
    2: a young onion before the bulb has enlarged; eaten in salads
       [syn: {green onion}, {spring onion}, {scallion}]

from The Collaborative International Dictionary of English v.0.48

Scallion \Scal"lion\, n. [OF. escalone, eschaloingne, L. caepa
   Ascalonia onion of Ascalon; caepa onion + Ascalonius of
   Ascalon, fr. Ascalo Ascalon, a town in Palestine. Cf.
   {Shallot}.]
   1. (Bot.) A kind of small onion ({Allium Ascalonicum}),
      native of Palestine; the eschalot, or shallot.
      [1913 Webster]

   2. Any onion which does not "bottom out," but remains with a
      thick stem like a leek. --Amer. Cyc.
      [1913 Webster]