cold ulcer

From The Collaborative International Dictionary of English v.0.48:

Ulcer \Ul"cer\, n. [F. ulc[`e]re, L. ulcus, gen. ulceris, akin
   to Gr. ?.]
   1. (Med.) A solution of continuity in any of the soft parts
      of the body, discharging purulent matter, found on a
      surface, especially one of the natural surfaces of the
      body, and originating generally in a constitutional
      disorder; a sore discharging pus. It is distinguished from
      an abscess, which has its beginning, at least, in the
      depth of the tissues.
      [1913 Webster]

   2. Fig.: Anything that festers and corrupts like an open
      sore; a vice in character.
      [1913 Webster]

   Cold ulcer (Med.), an ulcer on a finger or toe, due to
      deficient circulation and nutrition. In such cases the
      extremities are cold.
      [1913 Webster]
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