\Ex`u*da"tion\, n.
The act of exuding; sweating; a discharge of humors,
moisture, juice, or gum, as through pores or incisions; also,
the substance exuded.

      Resins, a class of proximate principles, existing in
      almost all plants and appearing on the external surface
      of many of them in the form of exudations. --Am. Cyc.