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- root sign
- Roots mechanical supercharger
- roots of an algebraic group
- root solver
- root space
- root space decomposition
- root-square-mean fluctuation of deflection angle of suspended coil galvanometer
- root-squaring method
- root-stability
- root statistic
- rootstock
- rootstock nursery
- root subgroup
- root subspace
- roots vacuum pump
- root symbol
- root system
- root system of a semi-simple Lie algebra
- root system of a semisimple Lie algebra
- root table
- Root-Takahira Agreement
- root test
- root theorem
- Root Thesaurus
- root tip