endocrine gland

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various glands producing hormonal secretions that pass directly into the bloodstream. The endocrine glands include the thyroid, parathyroids, anterior and posterior pituitary, pancreas, adrenals, pineal, and gonads.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun anatomy Any of various glands that secrete hormones directly into the blood or lymph and not through a duct.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of the glands of the endocrine system that secrete hormones directly into the bloodstream