Invisible \In*vis"i*ble\, a. [F. invisible, L. invisibilis. See {In-} not, and {Visible}.] Incapable of being seen; not perceptible by vision; not visible. To us invisible, or dimly seen In these thy lowest works. --Milton. {Invisible bird} (Zo["o]l.), 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.