biserrate

from WordNet (r) 3.0 (2006)

biserrate
    adj 1: having saw-like notches with the notches themselves
           similarly notched

from The Collaborative International Dictionary of English v.0.48

Biserrate \Bi*ser"rate\, a. [Pref. bi- + serrate.]
   [1913 Webster]
   1. (Bot.) Doubly serrate, or having the serratures serrate,
      as in some leaves.
      [1913 Webster]

   2. (Zool.) Serrate on both sides, as some antenn[ae].
      [1913 Webster] Bisetose