Source : Webster's Revised Unabridged Dictionary (1913)

Stroma \Stro"ma\, n.; pl. {Stromata}. [L., a bed covering, Gr. ?
   a couch or bed.]
   1. (Anat.)
      (a) The connective tissue or supporting framework of an
          organ; as, the stroma of the kidney.
      (b) The spongy, colorless framework of a red blood
          corpuscle or other cell.

   2. (Bot.) A layer or mass of cellular tissue, especially that
      part of the thallus of certain fungi which incloses the
      perithecia.

Source : WordNet®

stroma
     n 1: the dense colorless framework of a chloroplast
     2: the supporting tissue of an organ (as opposed to parenchyma)
     [also: {stromata} (pl)]