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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| experimental psychology | |
| —n | |
| the scientific study of the individual behaviour of man and other animals, esp of perception, learning, memory, motor skills, and thinking | |
experimental psychology n.
The branch of psychology that studies conditioning, learning, perception, motivation, emotion, language, and thinking by conducting experiments under controlled conditions.
Any of the branches of psychology that make extensive use of experimental methods.