hawk-eye

hawk's-eye

[hawks-ahy]
noun
a dark-blue chatoyant quartz formed by the silicification of crocidolite, used for ornamental purposes. Compare tiger's-eye ( def 1 ).

Origin:
1675–85

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World English Dictionary
Hawk-Eye
 
n
trademark an optical ball-tracking device used as an aid to commentators in certain sports, and as an officiating tool in major tennis tournaments

hawk's-eye
 
n
a dark blue variety of the mineral crocidolite: a semiprecious gemstone

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