Noun

(en noun)

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

:* {{quote-magazine, date=

, year=2010 , month=April , first= , last= , author=Frank Zullo , coauthors= , title=Imaging Prehistoric Sunrises , volume=38 , issue=4 , page=50 , magazine=Astronomy , publisher= , issn= , url= , passage=For both images I placed a Kodak 4.0 neutral-density gelatin filter over the lens to reduce the Sun's brightness. }}