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n.1.A reflecting optical glass or instrument; a mirror.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Moreover, a portable digital vibrometer (PDV), which was mounted on the shaking table and fixed by a holder, could measure the axis velocity of the liquid column along the TLCD with the catopter created through light and thin floating slices or special reflective material.