The Collaborative International Dictionary
Aden-
Aden- \Aden-\ or Adeno- \Adeno-\[Gr. ?, ?, gland.] Combining forms of the Greek word for gland; -- used in words relating to the structure, diseases, etc., of the glands. [1913 Webster] ||
Wiktionary
aden-
pre. (alternative form of adeno- dot=, English) used before vowels.