WordReference Random House Unabridged Dictionary of American English © 2026
thoraco-, 
  1. a combining form representing thorax in compound words:thoracoplasty.
Also,[esp. before a vowel,] thorac-. 
  • see -o- combining form representing Greek thōrāk- (stem of thó̄rāx) chest

Collins Concise English Dictionary © HarperCollins Publishers::
thoraco-, (before a vowel) thorac- combining form
  1. thorax: thoracotomy
'thoraco-' also found in these entries (note: many are not synonyms or translations):
thorac- - thoracoplasty - thoracostomy - thoracotomy

Forum discussions with the word(s) "thoraco-" in the title:


Look up "thoraco-" at Merriam-Webster
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