Invisible

Part of speech: noun (n.)

1. An invisible person or thing; specifically, God, the Supreme Being.

2. A Rosicrucian; -- so called because avoiding declaration of his craft. [Obs.]

3. One of those (as in the 16th century) who denied the visibility of the church. Shipley.

Part of speech: adjective (a.)

Incapable of being seen; not perceptible by vision; not visible. To us invisible, or dimly seen In these thy lowest works. Milton. Invisible bird (Zoöl.), 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.