Look up grex in Wiktionary, the free dictionary.

Grex or GREX may refer to:

• Grex (biology), a multicellular aggregate of amoeba of the phyla Acrasiomycota or Dictyosteliomycota
• Grex (horticulture), (pl. greges) a kind of group used in horticultural nomenclature applied to the progeny of an artificial cross from specified parents
• Formerly used to mean species aggregate
• Georgetown Rail Equipment Company, a provider of railway maintenance equipment and related services based in Georgetown, Texas

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