Source : Webster's Revised Unabridged Dictionary (1913)

Blade \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.

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

Blade \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.

Blade \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.

Source : WordNet®

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