1) US publishing family 2) Insecticide 
[title] Ridder (Dutch - `knight`) is a noble title in the Netherlands and Belgium. Traditionally it denotes the second lowest rank within the nobility, standing below Baron, but above the untitled nobility (Jonkheer) in these countries. `Ridder` is a literal translation of Latin Eques and originally meant `horseman` or `rider`. For its hist...
• (n.) One who, or that which, rids.
Rid'der noun One who, or that which, rids. 
Ridder is a Norwegian, modern, creamery semi-soft cheese made from cow's milk.