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optics
From The Collaborative International Dictionary of English v.0.48:
Optics \Op"tics\, n. [Cf. F. optique, L. optice, Gr. ? (sc. ?). See Optic.] That branch of physical science which treats of the nature and properties of light, the laws of its modification by opaque and transparent bodies, and the phenomena of vision. [1913 Webster]

