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From Biology-Online Dictionary
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incapable of being seen; not perceptible by vision; not visible. To us invisible, or dimly seen in these thy lowest works.

(Science: zoology) (Milton) invisible bird, a small, shy singing bird (Myadestes sibilons), of St. Vincent islands. Invisible green, a very dark shade of green, approaching to black, and liable to be mistaken for it.

Origin: f. Invisible, L. Invisibilis. See in- not, and visible.