properly, the leaf, or flat part of the leaf, of any plant, especially of gramineous plants. the term is sometimes applied to the spire of grasses.-the cutting part of an instrument; as, the blade of a knife or a sword.-the broad part of an oar; also, one of the projecting arms of a screw propeller.-the scapula or shoulder blade.-the principal rafters of a roof.-the four large shell plates on the sides, and the five large ones of the middle, of the carapace of the sea turtle, which yield the best tortoise shell.-a sharp-witted, dashing, wild, or reckless, fellow; -- a word of somewhat indefinite meaning.-to furnish with a blade.-to put forth or have a blade.