Source : Webster's Revised Unabridged Dictionary (1913)

Interlineal \In`ter*lin"e*al\, Interlinear \In`ter*lin"e*ar\, a.
   [Cf. LL. interlinearis, F. interlin['e]aire.]
   Contained between lines; written or inserted between lines
   already written or printed; containing interlineations; as,
   an interlinear manuscript, translation, etc. --
   {In`ter*lin"e*ar*ly}, adv.

Source : WordNet®

interlinear
     adj : written between lines of text [syn: {interlineal}]