Having an unknown or concealed origin or source, particularly used in medicine to describe diseases that arise without identifiable external causes.
Combining Greek 'kryptos' (hidden) with 'genous' (producing), this is a variant form that emerged slightly later than 'cryptogenic' but carries the same medical weight, used interchangeably in clinical contexts.
While 'cryptogenic' became more popular in modern medicine, 'cryptogenous' survives in older medical texts and some European medical traditions—it's like having two words for the same mysterious medical puzzle.
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