different between meningismus vs meningism

English

meningismus (uncountable)

meningism (countable and uncountable, plural meningisms)

(medicine) A set of symptoms similar to those of meningitis but not caused by it, involving the triad of nuchal rigidity (neck stiffness), photophobia, and headache, a sign of irritation of the meninges.
(medicine, loosely, informally) Such symptoms as identified clinically but before knowledge of their cause is ascertained (that is, before diagnosis or before its confirmation); meningeal symptoms.

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