Wiktionary
ductless gland
n. (context anatomy English) Any gland that secretes hormones directly into the bloodstream; especially the endocrine gland
WordNet
ductless gland
n. any of the glands of the endocrine system that secrete hormones directly into the bloodstream [syn: endocrine gland, endocrine]
Usage examples of "ductless gland".
My guess would be that uranium salts act as a catalytic agent in the processes of metabolism and digestion, somewhat as some of our own ductless gland secretions.
And with this came an understanding of what the increased millierg generating capacity of the corpus callosum during periods of increased ductless gland activity, which had puzzled students of the human brain for thirty years, actually meant.