The Collaborative International Dictionary of English v.0.48:

Noli-me-tangere \No"li-me-tan"ge*re\, n. [L., touch me not.]
   1. (Bot.)
      (a) Any plant of a genus of herbs (Impatiens) having
          capsules which, if touched when ripe, discharge their
          seeds. -- See Impatiens.
      (b) The squirting cucumber. See under Cucumber.
          [1913 Webster]

   2. (Med.) A name formerly applied to several varieties of
      ulcerous cutaneous diseases, but now restricted to Lupus
      exedens, an ulcerative affection of the nose.
      [1913 Webster]

WordNet (r) 3.0 (2006):

noli-me-tangere
    n 1: a cancerous ulcer of soft tissue and bone