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, a leading contender for valedictorian of his high school, is a 210-month-old boy with disturbing interests in etymology, vexillology, geography, and law. Adam would like to one day visit Tajikistan and probably isn't spying for the Kyrgyz government.
The Etymology Nerd