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Crux
(A). A knotty point, a difficulty. Instantia crucis
means a crucial test, or the point where two similar diseases
crossed and showed a special feature. It does not refer to the
cross, an instrument of punishment; but to the crossing of two lines,
called also a node or knot; hence a trouble or difficulty.
Qua te mala crux agitat? (Plautus); What evil cross distresses you?
—i.e. what difficulty, what trouble are you under?
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Crux from Infoplease:
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