Quak"ing,

a. & n. from Quake, v.

Quaking aspen Bot., an American species of poplar (Populus tremuloides), the leaves of which tremble in the lightest breeze. It much resembles the European aspen. See Aspen. -- Quaking bog, a bog of forming peat so saturated with water that it shakes when trodden upon. -- Quaking grass. Bot. (a) One of several grasses of the genus Briza, having slender-stalked and pendulous ovate spikelets, which quake and rattle in the wind. Briza maxima is the large quaking grass; B. media and B. minor are the smaller kinds. (b) Rattlesnake grass (Glyceria Canadensis).

© Webster 1913.