secre'tion

[L. secemere (pp. secreius')^ to separate, divide off.] i. The production by a cell or aggregation of cells (a gland) of some substance differing in chemical and physical properties from the body from which or by which it is produced. 2. The product, solid, liquid, or gaseous, of cellular or glandular activity. secretion is stored up in or utilized by the animal or plant in which it is produced, thereby differing from an excretion which is intended to be expelled from the body, inter'nal s., an endocrine, an autacoid, the product of one of the so-called endocrine glands which is not discharged externally but is taken up directly into the blood; see chalone and hormone.