What is the blow dryer attachment that spreads airflow gently over a larger area called?

The blow dryer attachment that spreads airflow gently over a larger area is known as a diffuser. This tool is particularly beneficial for curly or wavy hair, as it helps to reduce frizz and enhance natural curl patterns. By dispersing the airflow, the diffuser allows hair to dry more evenly and gently, preventing the disruption of curl structure that can occur with concentrated airflow.

In contrast, the other attachments like the concentrator focus airflow in a specific direction, which is ideal for straightening or smoothing hairstyles. The nozzle is also designed for directing air but does not provide the same gentle effect as a diffuser. The vent plate, while less commonly referred to, is typically part of the blow dryer itself and does not serve the same purpose in manipulating airflow for styling. Thus, the design and function of the diffuser make it the appropriate choice for achieving beautifully defined curls and minimizing frizz.