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geocentric theory

the theory, attributed to Alexandrian astronomer, geographer, and mathematician Ptolemy (2nd century ce), that the earth is the center of the universe and that the heavenly bodies move around it. Also called Ptolemaic theory. Compare heliocentric theory.

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Psychology term of the day

May 26th 2024

tranquilizer

tranquilizer

n. a drug that is used to reduce physiological and subjective symptoms of anxiety. In the past, distinctions were made between so-called major tranquilizers (antipsychotics) and minor tranquilizers (anxiolytics; e.g., benzodiazepines).