Definitions from Wiktionary ( )

▸ verb:  (transitive) To cast a spell on (specifically an evil spell), to bewitch.
▸ noun:  An evil spell or curse.
▸ noun:  A witch.
▸ noun:  (rare) A spell (now rare but still found in compounds such as hex sign and hexcraft).
▸ noun:  A hexagonal space on a game board.
▸ noun:  (climbing) a hexagon-shaped item of rock climbing equipment intended to be wedged into a crack or other opening in the rock.
▸ noun:  (computing, informal) Clipping of hexadecimal. [(arithmetic, computing, uncountable) A number system with base sixteen, using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F, most used in computing as a hexadecimal digit can represent four bits, half a standard byte, and thus a single byte can be represented conveniently with two digits.]
▸ noun:  (chemistry) Clipping of uranium hexafluoride. [(chemistry) a binary compound of uranium and fluorine, UF₆; it is a grey solid, or heavy gas, and is used in the uranium enrichment process to produce fuel for nuclear reactors or nuclear weapons]

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