1. [n]  the flat part of a tool or weapon that (usually) has a cutting edge
2. [n]  flat surface that rotates and pushes against air or water
3. [n]  the part of the skate that slides on the ice
4. [n]  a cutting or thrusting weapon with a long blade
5. [n]  a broad flat body part (as of the shoulder or tongue)
6. [n]  a cut of beef from the shoulder blade
7. [n]  something long and thin resembling a blade of grass; "a blade of lint on his suit"
8. [n]  a dashing young man; "gay young blades bragged of their amorous adventures"
9. [n]  especially a leaf of grass or the broad portion of a leaf as distinct from the petiole

1. \Blade\ (bl[=a]d), n. [OE. blade, blad, AS. bl[ae]d leaf;
   akin to OS., D., Dan., & Sw. blad, Icel. bla[eth], OHG. blat,
   G. blatt, and perh. to L. folium, Gr. fy`llon. The root is
   prob. the same as that of AS. bl[=o]wan, E. blow, to blossom.
   See {Blow} to blossom, and cf. {Foil} leaf of metal.]
   1. 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 crimson dulse . . . with its waving blade.
                                                  --Percival.
            First the blade, then ear, after that the full corn
            in the ear.                           --Mark iv. 28.
   2. The cutting part of an instrument; as, the blade of a
      knife or a sword.
   3. The broad part of an oar; also, one of the projecting arms
      of a screw propeller.
   4. The scapula or shoulder blade.
   5. pl. (Arch.) The principal rafters of a roof. --Weale.
   6. pl. (Com.) 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. --De
      Colange.
   7. A sharp-witted, dashing, wild, or reckless, fellow; -- a
      word of somewhat indefinite meaning.
            He saw a turnkey in a trice Fetter a troublesome
            blade.                                --Coleridge.
   

2. \Blade\ (bl[=a]d), v. t.
   To furnish with a blade.
   

3. \Blade\, v. i.
   To put forth or have a blade.
         As sweet a plant, as fair a flower, is faded As ever in
         the Muses' garden bladed.                --P. Fletcher.
   

4. \Blade\, n.
   The flat part of the tongue immediately behind the tip, or
   point.
         ``Lower blade'' implies, of course, the lower instead
         of the upper surface of the tongue.      --H. Sweet.
   

applied to the glittering point of a spear (Job 39:23) or sword (Nah. 3:3), the blade of a dagger (Judg. 3:22); the "shoulder blade" (Job 31:22); the "blade" of cereals (Matt. 13:26).