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]

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "physiotherapy":
   Metrazol therapy, X-ray therapy, actinotherapy, aerosol therapy,
   aerotherapeutics, aerotherapy, arsenotherapy, autoserum therapy,
   bacterial therapy, bacteriotherapy, bibliotherapy, biotherapy,
   buffer therapy, cardiotherapy, chemotherapy, chrysotherapy,
   climatotherapy, cold therapy, collapse therapy,
   constitutional therapy, contact therapy, crymotherapy,
   dermatotherapy, dietotherapy, dye therapy, endocrinotherapy,
   fever therapy, frigotherapy, galactotherapy, glandular therapy,
   gold therapy, hemotherapy, hyperbaric therapy,
   immunization therapy, infrared therapy, intravenous therapy,
   iodotherapy, maggot therapy, malariotherapy, mechanotherapy,
   nonspecific therapy, occupational therapy, opsonic therapy,
   organotherapy, oxygen therapy, pharmacotherapy, phototherapy,
   physical therapy, protein therapy, pyretotherapy, radium therapy,
   ray therapy, replacement therapy, serotherapy, shock therapy,
   specific therapy, suggestion therapy, surgicotherapy,
   ultrasonic therapy, ultraviolet therapy, vaccine therapy