• Webster's Revised Unabridged Dictionary
    • n Caligo (Med) Dimness or obscurity of sight, dependent upon a speck on the cornea; also, the speck itself.
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Century Dictionary and Cyclopedia
    • n caligo Dimness of sight; caligation. Also called achlys.
    • n caligo [capitalized] [NL.] A genus of butterflies, of the subfamily Brassolinæ. C. eurylochus is the enormous owl-butterfly of South America, sometimes expanding 9 inches. C. uranus is another species with an orange bar across the wings.
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Webster's Revised Unabridged Dictionary
L., darkness