/trip"euhr/ , n.
1. a person or thing that trips.
2. Mach.
a. a tripping mechanism; a trip.
b. an apparatus causing a signal or other operating device to be tripped or actuated.
3. Brit. Informal. a person who goes on a pleasure trip or excursion; excursionist.
4. Slang. a person who is under the influence of a hallucinogenic drug, esp. LSD.
[ 1350-1400; ME; see TRIP 1 , -ER 1 ]