- a combining form representing thorax in compound words: thoracoplasty.
Also especially before a vowel, thorac-.
Origin of thoraco-
combining form representing Greek thōrāk- (stem of thṓrāx) chest; see -o-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
before a vowel thorac-