Polycystic Ovarian Disease: This disease, also commonly known as PCOS, refers to cysts that form from a buildup of follicles. They cause the ovaries to enlarge and create a thick outer covering, which may prevent ovulation from occurring. They are often the cause of fertility problems.
dune. n. A hill or ridge of wind-blown sand. [French, from Old French, from Middle Dutch. ; see dheuÉ- in Indo-European roots .].
Dune growth and movement is the result of sand flow on and around a dune during periods when the wind is strong enough to move sand (for dry sand this threshold is about 15 mph). Dunes are constantly changing shape in response to changes in wind velocity or direction.