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sclera

noun [C usually sing]
 
 
/ˈsklɪə.rə/ US  /ˈsklɪr.ə/ specialized

Definition

the white layer that covers the outside of the eyeThe eye and surrounding areaEyesight, glasses and lensesUsing the eyes
(Definition of sclera noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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