X-ray

Senso (Inglese)

Frequenza

C1
Pronunciato come (IPA)
/ˈɛks ɹeɪ/
Etimologia (Inglese)

From X + ray, a calque of German X-Strahl, coined by Wilhelm Röntgen upon his discovery of the rays in 1895, where X signifies their unknown nature. The chess sense is metaphorical, referring to control passing through a seemingly solid barrier.

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