Tetrad
From Wikipedia, the free encyclopedia
Tetrad may refer to:
- Tetrad (chromosomal formation), a chromosomal formation in meiosis
- Tetrad (general relativity), a mathematical frame of reference in general relativity
- Tetrad (genetics), the four spores of a yeast
- Tetrad (Greek philosophy), the first number formed by the addition and multiplication of equals
- Tetrad (index notation), a concept in differential geometry
- Tetrad (music), a set of four notes
- Tetrad (unit of area), an area 2km x 2km square
- Tetromino, a shape composed of four squares
- Tetrad of media effects, a pedagogical tool

