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 .].
Sand dunes, which protect the coastline from storm winds and waves, are formed when waves carry sand to the beach, where the wind picks it up and blows it inland. Gradually, the sand piles up and plants such as sea oats begin to grow in it. The sea oats slowly cover the entire dune and protect it from erosion.