lucus a non lucendo

lu·​cus a non lu·​cen·​do | \ˈlükəˌsā¦nänlüˈsenˌdō\

Definition of lucus a non lucendo 

: an illogical explanation or absurd derivation : non sequitur the whole discussion may seem a lucus a non lucendo for all the light it throws upon the effect of the classics on mediaeval literature— H. O. Taylor

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History and Etymology for lucus a non lucendo

New Latin, a grove from not being light; from the practice ascribed to ancient Roman etymologists of deriving words from their semantic opposites, as lucus (“grove”) from lucēre (“to shine, be light”) because a grove is not light

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to make faulty or ineffective

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