Which word is not derived from ludere?

a. collusion

b. illusion

c. prelude

d. ablution

e. ellude

Ludere means to trick. Collusion is secret, illusion is a trick, elude is to avoid escape. These are not options. A prelude is an introduction - almost like a taste to trick you into reading, hearing, seeing more. An ablution is a washing - not connected to a trick at all. Ablution is your answer.