The Collaborative International Dictionary of English v.0.48:

Lymph \Lymph\, n. [L. lympha: cf. F. lymphe.]
   1. A spring of water; hence, water, or a pure, transparent
      liquid like water.
      [1913 Webster]

            A fountain bubbled up, whose lymph serene
            Nothing of earthly mixture might distain. --Trench.
      [1913 Webster]

   2. (Anat.) An alkaline colorless fluid, contained in the
      lymphatic vessels, coagulable like blood, but free from
      red blood corpuscles. It is absorbed from the various
      tissues and organs of the body, and is finally discharged
      by the thoracic and right lymphatic ducts into the great
      veins near the heart.
      [1913 Webster]

   3. (Med.) A fibrinous material exuded from the blood vessels
      in inflammation. In the process of healing it is either
      absorbed, or is converted into connective tissue binding
      the inflamed surfaces together.
      [1913 Webster]

   4. (Physiol. Chem.) A fluid containing certain products
      resulting from the growth of specific microorganisms upon
      some culture medium, and supposed to be possessed of
      curative properties.
      [Webster 1913 Suppl.]

   Lymph corpuscles (Anat.), finely granular nucleated cells,
      identical with the colorless blood corpuscles, present in
      the lymph and chyle.

   Lymph duct (Anat.), a lymphatic.

   Lymph heart. See Note under Heart, n., 1.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lymph
    n 1: a thin coagulable fluid (similar to plasma but) containing
         white blood cells (lymphocytes) and chyle; is conveyed to
         the blood stream by lymphatic vessels

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "lymph":
   chyle, colostrum, discharge, gleet, humor, ichor, lachryma,
   lactation, leukorrhea, matter, milk, mucor, mucus, peccant humor,
   phlegm, purulence, pus, rheum, saliva, sanies, serous fluid, serum,
   snot, suppuration, sweat, tear, teardrop, the whites, urine