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Any one of numerous species of small, fresh-water, chætopod annelids of the tribe Naidina. They belong to the Oligochæta.

A water wheel having a vertical axis, and an inner and outer tapering shell, between which are vanes or floats attached usually to both shells, but sometimes only to one.

Incapable of being assisted; helpless. [R.] Shak.

Incapable of being aided. "Her unaidable estate." Shak.

ced by a graduated system of dotted and checkered spots, usually nearly invisible to the unaided eye, produced by the interposition between the camera and the object of a screen. The name alludes to the fact that this process was the first that was practically successful in reproducing the half tones of the photograph.…

Bringing no help; unaiding. [Obs.] Yet since the gods have been Helpless foreseers of my plagues. Chapman.

k purple or crimson flowers in flattened heads. -- Mourning dove (Zoöl.), a wild dove (Zenaidura macroura) found throughout the United States; -- so named from its plaintive note. Called also Carolina dove. See Illust. under Dove. -- Mourning warbler (Zoöl.), an American ground warbler (Geothlypis Philadelphia). The…

Unprovided with needful or desirable accessories, means of sustenance, etc.; destitute; unaided; bare. Patriots who had exposed themselves for the public, and whom they say now left naked. Milton.

r phenomenon was first discovered by Sir W. R. Hamilton by mathematical reasoning alone, unaided by experiment. -- Differential refraction (Astron.), the change of the apparent place of one object relative to a second object near it, due to refraction; also, the correction required to be made to the observed relative…

Not supported or encouraged; not countenanced; unaided. Daniel.