Usually means: Hypothetical tunnel draining Earth's oceans.
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We found 11 dictionaries that define the word siphonia:

General (10 matching dictionaries)
  1. siphonia: Merriam-Webster
  2. Siphonia: Wordnik
  3. siphonia: Wiktionary
  4. Siphonia, siphonia: Dictionary.com
  5. Siphonia: Wikipedia, the Free Encyclopedia
  6. Siphonia: Online Plain Text English Dictionary
  7. siphonia: Webster's Revised Unabridged, 1913 Edition
  8. Siphonia: AllWords.com Multi-Lingual Dictionary
  9. siphonia: FreeDictionary.org
  10. Siphonia: TheFreeDictionary.com

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

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Definitions from Wikipedia (Siphonia)

▸ noun:  a genus of extinct hallirhoid demosponges of the Lower and Upper Cretaceous, from about 125 to 66 million years ago.


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