The Collaborative International Dictionary of English v.0.48:

Struma \Stru"ma\, n. [L., a scrofulous tumor.]
   1. (Med.) Scrofula.
      [1913 Webster]

   2. (Bot.) A cushionlike swelling on any organ; especially,
      that at the base of the capsule in many mosses.
      [1913 Webster]

WordNet (r) 3.0 (2006):

struma
    n 1: abnormally enlarged thyroid gland; can result from
         underproduction or overproduction of hormone or from a
         deficiency of iodine in the diet [syn: goiter, goitre,
         struma, thyromegaly]
    2: a form of tuberculosis characterized by swellings of the
       lymphatic glands [syn: scrofula, struma, king's evil]