We will typically expand one side of the chest cavity at a time, with each surgery separated by six months to one year. The surgery involves a collaborative effort between thoracic surgery and plastic surgery. Ribs four through nine are approached.
Top definition. a tool. an offensive comment, mainly aimed towards the male of the species, when one is being particularly nasty, stupid, or facetious.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  instrument(noun) a device that requires skill for proper use. 2  instrument, tool(noun) the means whereby some act is accomplished. my greed was the instrument of my destruction; science has given us new tools to fight disease.