var.

Noun
  1. (biology) a group of organisms within a species that differ in trivial ways from similar groups (synset 108128123)
    "a new strain of microorganisms"
    referred to in: biological science, biology - the science that studies living organisms
    is a type of: taxon, taxonomic category, taxonomic group - animal or plant group having natural relations
    belongs to: species - (biology) taxonomic group whose members can interbreed
    same as: form, strain, variant

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