dichorial twins

a set of twins that had separate chorionic membranes as embryos. They include dizygotic twins as well as monozygotic twins that separate shortly after fertilization. Compare monochorial twins.

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Psychology term of the day

January 3rd 2025

unipolar disorder

unipolar disorder

persistent or pervasive depression that does not involve a manic episode, a hypomanic episode, or a mixed episode. As such, it contrasts with bipolar disorder. The term is sometimes used synonymously with major depressive disorder. Also called unipolar depression.