en·do·crine (ĕn′də-krĭn, -krēn′) adjective: 1. Secreting internally. 2. Of or relating to endocrine glands or the hormones secreted by them. noun: 1. The secretion of an endocrine gland; a hormone. 2. An endocrine gland. Source: www.thefreedictionary.com/endocrine