A woodwind instrument consisting of a tube with a row of holes that produce sound through vibrations caused by air blown across the edge of the holes, often tuned by plugging one or more holes with a finger; the Western concert flute, a transverse side-blown flute of European origin.
A lengthwise groove, such as one of the lengthwise grooves on a classical column, or a groove on a cutting tool (such as a drill bit, endmill, or reamer), which helps to form both a cutting edge and a channel through which chips can escape