ScienceAugust 25, 2026

tetrad

TEH-trad

Definition

A group or set of four items.

Etymology

Derived from the Ancient Greek word 'tetras' meaning 'four,' it entered English to describe sets of four items, often in scientific or philosophical contexts.

In the news

The article uses the term to describe the 'dark tetrad' in psychology, which refers to a specific grouping of four distinct personality traits.

Flat Tires, The Dark Tetrad, and Customized Bone Replacements

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