The word for today is…
crux (noun) – 1. a vital or decisive stage, point, etc.
2. a baffling problem or difficulty.
3. (Mountaineering) mountaineering the most difficult and often decisive part of a climb or pitch
4. (Heraldry) a rare word for cross
Source : The Free Dictionary
Etymology : In Latin, crux referred literally to an instrument of torture, often a cross or stake, and figuratively to the torture and misery inflicted by means of such an instrument. Crux eventually developed the sense of “a puzzling or difficult problem”; that was the first meaning that was used when the word entered English in the early 18th century. Later, in the late 19th century, crux began to be used more specifically to refer to an essential point of a legal case that required resolution before the case as a whole could be resolved. Today, the verdict on crux is that it can be used to refer to any important part of a problem or argument, inside or outside of the courtroom.
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