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Capitalize X in x-ray?

I see in the OED and on wikipedia that 'X-ray' can be both 'x-ray' and 'X-ray'; is there a preferred version for American English?

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It is indeed, I didn't see that. Thanks! –  mmr Sep 12 '11 at 18:23
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marked as duplicate by aedia λ, Thursagen, Daniel, Mr. Shiny and New 安宇, Matt Эллен Sep 12 '11 at 19:18

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Just Googling "x-ray" I see about equal usage of all three capitalization modes (X-Ray, X-ray, and x-ray). Wikipedia prefers "X-ray," as does this Stanford page on the TIP Style Guide, but those are just data points.

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