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metaldehyde
metalhead
metalinguistic
metalinguistics
metall-
metall.
metallic
metallic bond
metallic lens
metallicity
metalliferous
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metallic lens

me·tal·lic lens (plural me·tal·lic lens·es)


noun 
Definition:
 
wave-focusing device: a device consisting of louvers or slats, used to focus electromagnetic or sound waves

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