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optic axis

n.
1.a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted

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  • optic
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  • opsonization
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  • opsonisation
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  • optic chiasma
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  • optic cup
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    Idiom of the Day

    look like the cat that ate/swallowed the canary
    to seem very self-satisified, to look like you have just had some kind of success
    The boy looked like the cat that ate the canary when he won the race.



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    A leech is a worm that feeds on blood. It will pierce its victim's skin, fill itself with three to four times its own body weight in blood, and will not feed again for months. Leeches were once used by doctors to drain bad blood from sick patients.      .. More >>
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