15-Letter Words Containing: O,P,I,S,T,S

• To synthesize carbohydrates from carbon dioxide and water using the energy of light by photosynthesis

• a psychologist trained in psychophysics

• the mental representation of sexual activities

• an underactive thyroid gland; a glandular disorder resulting from insufficient production of thyroid hormones

• A form of psychology based on the direct experience of the self.

• a therapist who deals with mental and emotional disorders

• make (an organism or substance) sensitive to the influence of radiant energy and especially light

• the branch of psychiatry concerned with psychological methods

• the treatment of mental or emotional problems by psychological means

• greater than normal extension