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an instrument for measuring ocular halos.an instrument for estimating the size of erythrocytes by...

halo. In meteorology, short-lived circles or arcs, and less commonly spikes and crosses, of colored...

Arc showing the colors of the spectrum, violet inside and red outside, which appears when the sun...

a colored zone, usually showing pleochroic discoloration, that occurs around small inclusions of...

(n.) A mock moon; an image of the moon which sometimes appears at the point of intersection of two...