superorder

n. (Biology) taxonomic category that ranks above an order and below a class or subclass

In scientific classification used in biology, the order (Latin: ordo, plural ordines) is a rank between class and family (termed a taxon at that rank). The superorder is a rank between class and order. Exact details of formal nomenclature depend on the Nomenclature Code which applies.
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Noun
1. (biology) a taxonomic group ranking above an order and below a class or subclass
(hypernym) taxonomic group, taxonomic category, taxon
(classification) biology, biological science

(n.)
A group intermediate in importance between an order and a subclass.
  

superorder /'sju:pər'ɔ:də/
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