The Collaborative International Dictionary of English v.0.48:

Aden- \Aden-\ or Adeno- \Adeno-\[Gr. 'adh`n, 'ade`nos, gland.]
   Combining forms of the Greek word for gland; -- used in words
   relating to the structure, diseases, etc., of the glands.
   [1913 Webster] adenalgia

WordNet (r) 3.0 (2006):

Aden
    n 1: an important port of Yemen; located on the Gulf of Aden;
         its strategic location has made it a major trading center
         of southern Arabia since ancient times