graafian follicle: a vascular body in a mammalian ovary enclosing a developing egg
follicle: any small spherical group of cells containing a cavity
diabetes insipidus: a rare form of diabetes resulting from a deficiency of vasopressin (the pituitary hormone that regulates the kidneys); characterized by the chronic excretion of large amounts of pale dilute urine which results in dehydration and extreme thirst