adj. /ul'treuh luyt", ul"treuh luyt'/ ; n. /ul"treuh luyt'/ , adj.
1. extremely lightweight in comparison with others of its kind: a car with an ultralight engine.
2. something that is ultralight.
3. a small, light, inexpensive single-seat airplane that is essentially a motorized hang glider.
[ 1970-75; ULTRA- + LIGHT 2 ]