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Tetra is a Greek prefix meaning 4 (in constrast to quad- as in quadruped, which is Latin). Examples of "tetra" words include:
- In Solid Geometry a Tetrahedron (plural Tetrahedra) is a pyramid shape with six straight edges and four trangular faces.
- In chemistry, the number of subunits of like kind attached to a central molecule, as in carbon tetrachloride, a central carbon molecule with four chlorine atoms attached.
- In music a tetrachord is a chord or simultaneity with four pitches or pitch classes.
- A tetraodontiformes is a kind of fish with 4 shapes of teeth
- A tetralogy is a work made up of 4 distinct works.
- Tetragrammaton is a 4-letter word in Hebrew.
- A tetramorph is an arrangement of 4 different elements.
- Tetration is the fourth operation in the sequence that starts with addition and multiplication.