The Collaborative International Dictionary of English v.0.48:

Benumb \Be*numb"\, v. t. [imp. & p. p. Benumbed; p. pr. & vb.
   n. Benumbing.] [OE. binomen, p. p. of binimen to take away,
   AS. beniman; pref. be + niman to take. See Numb, a., and
   cf. Benim.]
   To make torpid; to deprive of sensation or sensibility; to
   stupefy; as, a hand or foot benumbed by cold.
   [1913 Webster]

         The creeping death benumbed her senses first. --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

benumb
    v 1: make numb or insensitive; "The shock numbed her senses"
         [syn: numb, benumb, blunt, dull]