plural noun
Thio·bacteriales | \ "+ \

Definition of Thiobacteriales 

in some classifications

: an order of bacteria of various shapes usually containing either sulfur granules or bacteriopurpurin or both, usually thriving best in the presence of hydrogen sulfide, and comprising the families Achromatiaceae, Beggiatoaceae, and Rhodobacteriaceae

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History and Etymology for Thiobacteriales

New Latin, from Thiobacterium + -ales

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occurring twice a year or every two years

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