Endocrinology is the field of science concerned with studying hormones and the endocrine system. Once we eliminate the -ology suffix, we're actually left with a word that literally means "secreting internally"! This is because, when the word was coined in 1914, it was composed of the prefix endo-, meaning "inside", and the Ancient Greek word krinein, which meant "separate". The hidden definition of endocrine implies the quality of glands to secrete hormones internally. Endo- comes from Ancient Greek endon, meaning "internal", and, through Proto-Hellenic, this derives from the Proto-Indo-European hendom, "in". Meanwhile, the root krinein also may be traced through Proto-Hellenic to Proto-Indo-European, in this case to the reconstruction krey, meaning "to sift". Usage of the word endocrinology steadily increased until a peak in the early 1980s, however it has recently decreased dramatically, perhaps due to fewer advances in the field nowadays.
Adam Aleksic, an incoming freshman at Harvard University, has been described as the internet's sixth most famous etymologist. He has disturbing interests in linguistics, vexillology, geography, board games, limericks, and law, and he loves writing about himself in the third person.
The Etymology Nerd