The Collaborative International Dictionary of English v.0.48:

Taboo \Ta*boo"\, v. t. [imp. & p. p. Tabooed; p. pr. & vb. n.
   Tabooing.]
   To put under taboo; to forbid, or to forbid the use of; to
   interdict approach to, or use of; as, to taboo the ground set
   apart as a sanctuary for criminals. [Written also tabu.]
   [1913 Webster]