black drop

noun

Definition of black drop

  1. 1 :  vinegar of opium

  2. 2 :  an optical phenomenon observed in transits of Mercury and Venus near the instant of internal contact when the planet seems for the moment attached to the sun's limb by a dark ligament that is probably due to irradiation and the imperfections of the telescope —called also black ligament

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to cast off or become cast off

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