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From The Collaborative International Dictionary of English v.0.48:
Weedless \Weed"less\, a. 1. Free from weeds or noxious matter. [1913 Webster] 2. Free from weeds; -- said of a kind of motor-boat propeller the blades of which curve backwardly, as respects the direction of rotation, so that they draw through the water, and so do not gather weeds with which they come in contact. [Webster 1913 Suppl.]