Could not find any definition of word "tummock"
Usage examples of "tummock".
By the landmarks she gives him - a vegetable stand, a pond rimmed with willows, a double silo close to the road - he feels his way through the tummocks and swales of red earth crowded with shimmering green growth, merciless vegetation that allows not even the crusty eroded road embankments to rest barren but makes them bear tufts and mats of vetch and honeysuckle vines and fills the stagnant hot air with the haze of exhaled vapor.
Rabbit can see, over the shoulders that crowd around his body like green cotton tummocks, the shadow of his heart on an X-ray monitor screen, a twitching palegray ghost dimly webbed by its chambered structure and darkened in snaky streaks and bulbous oblongs by injections of the opacifying dye.
It would jar and jam the works, disrupt the concentrating green tummocks he is buried beneath.