Definition from Wiktionary, the free dictionary
gelatin (plural gelatins)
- a protein derived through partial hydrolysis of the collagen extracted from animal skin, bones, cartilage, ligaments, etc.
- an edible jelly made from this material
- a thin, translucent membrane used as a filter for photography or for theatrical lighting effects
2010 April, Frank Zullo, “Imaging Prehistoric Sunrises”, Astronomy, volume 38, number 4, page 50:
- For both images I placed a Kodak 4.0 neutral-density gelatin filter over the lens to reduce the Sun's brightness.
- gelatinous adj