Vyāna-vāyu—one of the internal bodily airs which is controlled by the aṣṭāṅga-yoga system. The vyāna-vāyu acts to shrink and expand.

Vyana-vayu-one of the internal bodily airs which is controlled by the astaṅga-yoga system. The vyana-vayu acts to shrink and expand.
 

Link to this page: https://prabhupadabooks.com/glossary/v/vyana-vayu-one-of-the-internal-bodily-airs-which-is-controll