What's the difference between ductless and dustless?

Ductless

Definition:

Example Sentences:

(1) In contrast, the adrenal cortex, a ductless gland, may not have a tight junction but does possess large gap junctions.
(2) Ductless, benchtop hoods have become a popular tool for use in the control of toxic substances in the laboratory.
(3) The mediastinal, lympho-epithelial organ was termed thymus to denote a ductless, gland-like body which has the appearance of a "warty excrescence" (Greek, thymos).
(4) The whole organ is composed of three pairs of endoepithelial, ductless glands, which cause prominent elevations on the larval head and are found in a specific arrangement.
(5) The identification of the first ductless glands and the characteristization of their products required the proof that their excision caused recognizable changes which could be reversed by replacement therapy.

Definition:

Example Sentences:

(1) Glossy advertising to attract this baby boomer herd tends to feature gentle images of arcadian bliss, of smiling men and women, white, smiling, heterosexual, smiling, holding hands, smiling, enjoying communal barbeques minus smoke and smell, smiling, playing card games in ordered, uncluttered scenes of dustless domesticity, smiling, dressed in styles that don’t come out of local chainstores, smiling, a couple frolicking on a swing, smiling, she's in sensible lavender swirl, he's outfitted by RM Williams, and is pushing her, gently, smiling, against a background of manicured lawns and gardens, all bathed in photoshopped sunlight.