different between pseudocroup vs pseudogroup

English

pseudo- +? croup

pseudocroup (uncountable)

(dated) The form of croup caused by a virus and not by the diphtheria bacterium.

pseudo- +? group

pseudogroup (plural pseudogroups)

(mathematics) An algebraic structure having elements that are homeomorphisms between subsets of a space
(chemistry) Any group of the extended periodic table containing lanthanides or actinides

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