“achromic”的英英意思

单词	achromic
释义	† aˈchromic, a. Obs. [same deriv. as achromatic, but improperly formed.] = achromatic (of which it seems to have been the earlier form). 1761Short in Phil. Trans. LII. 179 Reflector of 2 feet focus, with an achromic object-glass micrometer of 40 feet focus.

　

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