 Psychologist (n.) /sī ˈ käl ə j ə st/  an expert or specialist in psychology. Psychology : the science of mind and behavior 1. The jointly instructed psychologist had not received a transcript of the judge 's findings prior to preparing her report. 2. Peter is also a sports psychologist, working with elite athletes in a number of sports.

 Psychoanalyst (n.) / s ʌɪ k ə ʊˈ an ə l ɪ st/  A person who practises psychotherapy according to the principles of Sigmund Freud Psychoanalysis : a method of analyzing psychic phenomena and treating emotional disorders that involves treatment sessions during which the patient is encouraged to talk freely about personal experiences and especially about early childhood and dreams

 Orthodontist (n.) / θo ʊˈ d ɑː n.t ̬ɪ st/  A person whose job is to correct the position of the teeth. orthodontics : a branch of dentistry that deals with helping teeth to grow straight

 Optometrist (n.) / ɒ p ˈ t ɒ m ɪ tr ɪ st/  A person who practises optometry  a person whose job is to examine people's eyes to find out if they need eyeglasses or medical treatment Optometry : the occupation of measuring eyesight, prescribing corrective lenses, and detecting eye disease.

 Optician (n.) / ɒ p ˈ t ɪʃ ( ə )n/  expert of optical instruments who makes or fits optical lenses  a maker of or dealer in optical items and instruments

 Osteopath (n.) / ˈɒ s.ti. ə.pæθ /  a person who is trained to treat injuries to bones and muscles using pressure and movement osteopathy : a system of medical practice based on a theory that diseases are due chiefly to loss of structural integrity which can be restored by manipulation of the parts supplemented by therapeutic measures

 Chiropractor (n.) / ˈ ka ɪ.r ə ʊ.præk.t ə r/  a person whose job is to treat diseases by pressing a person's joints Chiropractic: a method of treating people who are sick or in pain by pushing and moving bones in the spine and joints

 Podiatrist (n.) /p ə ˈ da ɪ. ə.tr ɪ st/  a person whose job is to treat problems and diseases of people's feet. Podiatry : the medical care and treatment of the human foot

 Graphologist(n.) /gra- ˈ fä-l ə -jist/  expert in the determination of a person's character through handwriting analysis. Graphology : the study of handwriting, especially as used to infer a person's character.

 Gerontologist (n.) / ˌ jer- ə n- ˈ tä-l ə -jist /  one who specializes in gerontology, one who studies aging and the problems of the aged Gerontology : the scientific study of aging and the problems of the aged