Grey water
noun
1.
household waste water that can be reused for some purposes without purification, e.g. bath water, which can be used to water plants Compare black water
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A computer algebra system for differential geometry, gravitation and field theory. Version 3.1 works with PSL-based REDUCE 3.3 or 3.4. E-mail: V.V. Zhytnikov . (1994-12-16)