[1] : The Collaborative International Dictionary of English v.0.48

oesophagus \oesoph"agus\, n., oesophageal \oe`sophag"eal\,
   a., etc.
   same as esophagus, esophageal, etc.
   1913 webster
see also:
esophagus esophageal 

[2] : The Collaborative International Dictionary of English v.0.48

esophagus \esoph"agus\, n. nl., fr. gr. o'isofa`gos; root of
   o'i`sw which is used as future of fe`rein to bear, carry cf.
   skr. vimac to go, drive + fagei^n to eat. anat.
   that part of the alimentary canal between the pharynx and the
   stomach; the gullet. see illust. of digestive apparatus,
   under digestive. written also oesophagus. esopian
see also:
digestive apparatus digestive oesophagus 

[3] : WordNet (r) 2.0

oesophagus
     n : the passage between the pharynx and the stomach syn: esophagus,
          gorge, gullet
see also:
esophagus gorge gullet 

Oesophagus >> O Words
Oesophagus, definition of term: Oesophagus
oesophagus_pag1.html