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varicella-zoster virus
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varifocal

var·i·fo·cal [ vèrri fṓk'l ]


adjective 
Definition:
 
with many focusing distances: describes composite eyeglass lenses with varying focal length that allow different focusing distances for near, far, and intermediate vision



plural noun var·i·fo·cals 
Definition:
 
varifocal eyeglasses: eyeglasses with composite lenses for distant, intermediate, and near vision

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