Hormone
 Endocrine means something that is made by cells and released 'into' the blood or tissue. So 'endocrine glands' form hormones and release them into the blood or tissue. The opposite word is exocrine and means released 'outside' of the body. An example of 'exocrine' is sweat glands or saliva glands. When people say endocrine they usually mean 'glands that make hormones'.