VERB (3)

1. puncture and scar (the skin), as for purposes or tribal identification or rituals;
- Example: "The men in some African tribes scarify their faces"

2. scratch the surface of;
- Example: "scarify seeds"

3. break up;
- Example: "scarify soil"

The Collaborative International Dictionary of English v.0.48:

Scarify \Scar"i*fy\, v. t. [imp. & p. p. Scarified; p. pr. &
   vb. n. Scarifying.] [F. scarifier, L. scarificare,
   scarifare, fr. Gr. ? to scratch up, fr. ? a pointed
   instrument.]
   1. To scratch or cut the skin of; esp. (Med.), to make small
      incisions in, by means of a lancet or scarificator, so as
      to draw blood from the smaller vessels without opening a
      large vein.
      [1913 Webster]

   2. (Agric.) To stir the surface soil of, as a field.
      [1913 Webster] Scariose

WordNet (r) 3.0 (2006):

scarify
    v 1: puncture and scar (the skin), as for purposes or tribal
         identification or rituals; "The men in some African tribes
         scarify their faces"
    2: scratch the surface of; "scarify seeds"
    3: break up; "scarify soil"