from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The basic, central, or critical point or feature: the crux of the matter; the crux of an argument.
- n. A puzzling or apparently insoluble problem.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The basic, central, or essential point or feature.
- n. The critical or transitional moment or issue, a turning point.
- n. A puzzle or difficulty.
- n. The hardest point of a climb.
- n. A cross on a coat of arms.
from the GNU version of the Collaborative International Dictionary of English
- n. Anything that is very puzzling or difficult to explain.
from The Century Dictionary and Cyclopedia
- n. A cross. See phrases below. Specifically
- n. The Southern Cross, the most celebrated constellation of the southern heavens.
- n. The cross as an instrument of torture; hence, anything that puzzles or vexes in a high degree; a conundrum.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the most important point
- n. a small conspicuous constellation in the southern hemisphere in the Milky Way near Centaurus
Probably short for Medieval Latin crux (interpretum), torment (of interpreters), from Latin crux, cross.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin crux ("cross, wooden frame for execution") (English cross), from the Proto-Indo-European *(s)ker- (“to turn, to bend”). (Wiktionary)