pneumasis

plural pneumases

1. A pocket of air, or, figuratively, something resembling a pocket of air.

   1 more example

   Later Temple could hear them outside her door, whimpering and scuffing, or, rushing thickly in when the negro maid opened the door, climbing and sprawling onto the bed and into Miss Reba's lap with wheezy, flatulent sounds, billowing into the rich pneumasis of her breast and tonguing along the metal tankard which she waved in one ringed hand as she talked.

   1931, William Faulkner, Sanctuary, Library of America, published 1985, page 97