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 crescentic dune with a star dune superimposed on its crest is the most common complex dune. Simple dunes represent a wind regime that has not changed in intensity or direction since the formation of the dune, while compound and complex dunes suggest that the intensity and direction of the wind has changed.