The Collaborative International Dictionary of English v.0.48:

parapsychology \par`a*psy*chol"o*gy\ n.
   The field of study concerned with psychological phenomena not
   explainable by the laws of physics, especially extrasensory
   perception, telepathy, psychokinesis, precognition, and
   clairvoyance.

   Note: The field is controversial, most scientists holding the
         opinion that the supposed phenomena observed result
         from poor experimental design, or are mere statistical
         artifacts or in some cases deliberate fraud.
         [PJC]

WordNet (r) 3.0 (2006):

parapsychology
    n 1: phenomena that appear to contradict physical laws and
         suggest the possibility of causation by mental processes
         [syn: psychic phenomena, psychic phenomenon,
         parapsychology]

Moby Thesaurus II by Grady Ward, 1.0:

67 Moby Thesaurus words for "parapsychology":
   abnormal psychology, academic psychology, analytical psychology,
   animal psychology, applied psychology, clinical psychology,
   cognitive psychology, comparative psychology,
   constitutional psychology, criminal psychology, depth psychology,
   developmental psychology, differential psychology,
   dynamic psychology, ecological psychology, educational psychology,
   existential psychology, experimental psychology,
   faculty psychology, folk psychology, functional psychology,
   genetic psychology, group psychology, hormic psychology,
   industrial psychology, mental philosophy, metapsychics,
   metapsychism, morbid psychology, neuropsychology, panpsychism,
   phenomenological psychology, physiological psychology,
   popular psychology, psychic monism, psychical research, psychicism,
   psychics, psychism, psychobiochemistry, psychobiology,
   psychodiagnostics, psychodynamics, psychogenetics,
   psychogeriatrics, psycholinguistics, psychological medicine,
   psychological warfare, psychology, psychometrics, psychonomics,
   psychonomy, psychopathology, psychophysics, psychophysiology,
   psychosomatics, psychosophy, psychotechnics, psychotechnology,
   psychotherapeutics, race psychology, rational psychology,
   reactology, reflexology, self psychology, social psychology,
   structural psychology