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Oesophagus
Pronunciation
The word 'oesophagus' is pronounced with four syllables: 'ee-sof-uh-gus', with stress on the second syllable. 
Spelling Variants
'Oesophagus' is the British English spelling; in American English, it's spelled 'esophagus'. 
Medical Context
The word 'oesophagus' is used in medical or scientific contexts; it's not typically used in everyday conversation. 