The Collaborative International Dictionary of English v.0.48:

physiotherapy \phys`i*o*ther"a*py\
   (f[i^]z`[i^]*[-o]*th[~e]r"[.a]*p[y^]) n.
   Therapy that uses physical agents: exercise and massage and
   so on.

   Syn: physical therapy, physiatrics.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

physiotherapy
    n 1: therapy that uses physical agents: exercise and massage and
         other modalities [syn: physical therapy, physiotherapy,
         physiatrics]