Definitions for "Endocrine gland"
A gland that releases its materials directly into surrounding tissues or into the bloodstream, without using ducts. Many hormones are produced by endocrine glands.
A ductless gland that secretes a hormone into the bloodstream.
endo-, within + crin, secrete] (n) a "ductless" gland that secretes its substance (a hormone) directly into the general circulation or blood. Examples are the pineal, pituitary, thyroid, thymus, adrenals, etc.