Words are powerful. They can topple political regimes, polarize discourse, and frame our thoughts. It was not long ago that physicians often called asthma “reactive airways disease.”2 An unfortunate result of this was that many considered asthma to be a disease of airway smooth muscle, characterized by bronchodilator deficiency and diagnosed using bronchial provocation testing, which has a strong negative predictive value but is not a robust diagnostic test to confirm the clinical diagnosis of asthma.3 We face a similar confusion of words today. Flexible bronchoscopy has safely facilitated spelunking in an ever-increasing number of airways, and high-resolution CT scanning using low radiation doses and incremental scanning has increased resolution while decreasing radiation exposure to levels comparable to a standard chest radiograph,4 making high-resolution CT scanning almost a routine diagnostic test in some patients with chronic lung disease. We are recognizing that more airways than we suspected contain bacteria, inflammatory cells, or both and that more patients with chronic lung problems and relatively normal chest radiographs have high-resolution CT scanning evidence of bronchiectasis.