12-Letter Words Containing: I,L,T,H,I,E,R

• To lower the velocity and kinetic energy of fast neutrons in a nuclear reactor by use of a moderator, and thus increase the efficiency of fission

• making lively and cheerful

• making lively and joyful

• an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals

• the feeling of lively and cheerful joy

• To perform an inspection of an aircraft before the start of a flight.

• relating to or affecting or originating in the inner ear

• resembling a labyrinth in form or complexity

• highly complex or intricate and occasionally devious

• someone who makes or repairs articles of silver