secreting internally, in the body, into the blood; endocrine.

any of the endocrinal glands.

endocrine - a) producing secretions that are distributed in the body by way of the bloodstream; b) of, relating to, affecting or resembling an endocrine gland or secretion of endocrine tumours.

a gland (as the thyroid or the pituitary) that produces an endocrine secretion; endocrine, a ductless gland.