Definition of "ductless" [duct•less]

• Having no duct (adjective)

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• "They have no ducts from which to secrete their hormones and are sometimes referred to as the ductless glands."
• "During the eighteen-eighties, above all through the investigations of the Frenchman Brown-Séquard, attention had been directed to the importance for the vital functions of certain ductless gland-like organs."
• "With the lymphatics may be classified, for convenience, a number of organs called ductless or blood glands."