| invisible | Incapable of being seen; not perceptible by vision; not visible. "To us invisible, or dimly seen In these thy lowest works. <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. Source: Websters Dictionary (01 Mar 1998) |
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| invisible differentiation | Differentiation of the cellular chemical constituents in the embryo prior to cytodifferentiation; sometimes recognizable histochemically. Synonym: invisible differentiation. (05 Mar 2000) |
| invisible spectrum | The radiation lying on either side of visible light, i.e., infrared and ultraviolet light. (05 Mar 2000) |