Source : Webster's Revised Unabridged Dictionary (1913)

Lymphoma \Lym*pho"ma\, n. [NL. See {Lymph}, and {-oma}.] (Med.)
   A tumor having a structure resembling that of a lymphatic
   gland; -- called also {lymphadenoma}.

   {Malignant lymphoma}, a fatal disease characterized by the
      formation in various parts of the body of new growths
      resembling lymphatic glands in structure.

Source : WordNet®

lymphoma
     n : a neoplasm of lymph tissue that is usually malignant; one of
         the four major types of cancer
     [also: {lymphomata} (pl)]