The Collaborative International Dictionary of English v.0.48:
Interdict \In`ter*dict"\, v. t. [imp. & p. p. Interdicted; p.
pr. & vb. n. Interdicting.] [OE. entrediten to forbid
communion, L. interdicere, interdictum. See Interdict, n.]
1. To forbid; to prohibit or debar; as, to interdict
intercourse with foreign nations.
Charged not to touch the interdicted tree. --Milton.
2. (Eccl.) To lay under an interdict; to cut off from the
enjoyment of religious privileges, as a city, a church, an
An archbishop may not only excommunicate and
interdict his suffragans, but his vicar general may
do the same. --Ayliffe.