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| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| the offspring of a zebra and a donkey. |
developmental psychology n.
The branch of psychology concerned with the study of behavioral changes in an individual from birth until death.
The branch of psychology that studies the psychological growth of individuals. It deals with the psychological responses and changes in behavior that characterize such stages of life as infancy, adolescence, and old age.