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1 The International Society for the Study of Individual Differences (ISSID) was founded in 1983 to foster research on individual differences in temperament, intelligence, attitudes, and abilities.
zooid in Medicine. zooid zoÂ·oid (zÅ'oid') n. An organic cell or organized body that has independent movement within a living organism, especially a motile gamete such as a spermatozoon. An independent animallike organism produced asexually, as by budding or fission.