Final answer:
A Woodwind aerophone produces sound by splitting an air column on an edge, such as in instruments like flutes, clarinets, and oboes.
Step-by-step explanation:
An aerophone that requires an air column 'split on an edge' to produce sound is a Woodwind instrument. This is in contrast to brass instruments, which produce sound through the vibration of the player's lips against a mouthpiece. Woodwinds include instruments like the flute, clarinet, and oboe, which produce sound when air is directed against an edge, causing the air within a column to vibrate. Some woodwinds use a reed, which vibrates against a mouthpiece, while others split the air against an edge directly, as in the case of the flute.