Freebase(0.00 / 0 votes)Rate this definition: Japan. Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south.
An endocrinologist is a doctor who has studied the endocrine system and its diseases. These doctors know how to diagnose the diseases of the endocrine glands, and also how to treat them.
A reproductive endocrinologist is an Ob-Gyn (obstetrics and gynecology) doctor with special training in hormonal function as it pertains to reproductive function and infertility, reproductive medicine, as well as surgical procedures for anatomical disorders that affect fertility.