Final answer:
The term describing odd purposeful, goal-directed movements in individuals with a psychiatric disorder is 'stereotypy', a form of repetitive motor behavior.
Step-by-step explanation:
The term that describes odd purposeful movements that are goal-directed in individuals with a psychiatric disorder is c) Stereotypy. Stereotypic movements are repetitive motor behaviors that can include hand flapping, rocking, head banging, or other repetitive motions. These behaviors are evident in various conditions and often associated with impaired social skills, a need for strict adherence to certain rituals, or preoccupation with specific subjects. They are not to be confused with kinesis and taxis, which are movements in response to a stimulus seen in lower organisms such as insects or bacteria, nor with haloperidol side effects that can impact areas of the nervous system related to motor control.