gelatin

(noun) a colorless water-soluble glutinous protein obtained from animal tissues such as bone and skin. Synonyms: gelatine.

(noun) an edible jelly (sweet or pungent) made with gelatin and used as a dessert or salad base or a coating for foods. Synonyms: jelly.

(noun) a thin translucent membrane used over stage lights for color effects. Synonyms: gel.