Crucis

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Definition of Crucis in English English dictionary

Via Crucis
Any extremely arduous or painful experience requiring strength or courage to endure
Via Crucis
The Way of the Cross
experimentum crucis
A "crucial experiment"; a conclusive test to decide between different hypotheses

The “experimentum crucis” was a visit to Al-Híjaz, at once the most difficult and the most dangerous point by which a European can enter Arabia.

alpha crucis
the brightest star in the Southern Cross
beta crucis
the second brightest star in the Southern Cross