You searched for: “invisible
invisible
1. Impossible to see; not visible; for example, air and sound waves are invisible.
2. Not accessible to view; hidden: "The mountains have become invisible because of the clouds."
3. Not easily noticed or detected; inconspicuous.
4. Not published in financial statements; such as, an invisible asset.
This entry is located in the following units: -ible (page 2) vid-, video-, vis-, -vision, -visional, -visionally, visuo-, vu- (page 6)
A unit related to: “invisible
(Greek: the lower world [originally, invisible, to make invisible])
Word Entries at Get Words containing the term: “invisible
invisible radiation
On either side of the band of visible radiation are electromagnetic radiations which are invisible, but which can nevertheless be perceived.

People know about the stars because they can be seen and because of this, optical telescopes are the traditional instruments of astronomy; however, it must not be forgotten that light is only one form of electromagnetic radiation, and that it forms only a narrow band in the electromagnetic spectrum.

This entry is located in the following unit: Astronomy and related astronomical terms (page 13)