单词	ductless
释义	ductless /ˈdʌktləs / adjective Anatomy Denoting a gland that secretes directly into the bloodstream, such as an endocrine gland or a lymph gland.Endocrine glands by contrast are ductless, and secrete hormones directly into the bloodstream.... These cellular masses, designated as the ductless glands or glands of internal secretion, have during development lost their original connection with the epithelium of the free surface. Today's hype about genetic enhancement, cloning, and stem cells was preceded by a much earlier hype about hormones, secretions, and ductless glands.
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