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 .].
a series of long ridges oriented at right angles to the prevailing wind; these dunes form where vegetation is sparse and sand is very plentiful Barchan Dune a solitary sand dune shaped like a crescent with its tips pointing downward