What does the medical terminology combining form pector- mean?

Answer 1

pector- from L. pectus, breast bone, means "pectus, the chest, breast, thorax". Related terms sharing the same word part: [expectorate, lit. to cause to be out of the breast, fig. to expel phlegm from the chest, parapet, lit. protector of the breast, fig. a breastwork fortification, pectoral, lit. relating to the chest, pectoriloquy, lit. chest speaking]

Answer 2

Thoracic means chest. The medical prefix for this when used as part of another word is Thoraco- .
steth/o