DICT.TW Dictionary Taiwan

 In·vis·i·ble a.
 1. Incapable of being seen; not perceptible by vision; not visible. Specifically: (a) Not visible due to an inherent property, such as lack of color; as, the invisible air; invisible ink; (b) hidden from view; out of sight; (c) Not perceptible due to lack of light; (d) Too small or too distant to be perceived; as, people on the ground invisible at cruising altitude.
 To us invisible, or dimly seen
 In these thy lowest works.   --Milton.
 Invisible bird Zool., 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.