I. ˈəl-trə-ˌlīt adjective
Date: 1974
: extremely light in mass or weight
an ultralight alloy
an ultralight pullover
II. noun
Date: 1974
: a very light recreational aircraft typically for one person that is powered by a small gasoline engine
ULTRALIGHT
Meaning of ULTRALIGHT in English
Merriam-Webster's Collegiate English vocabulary. Энциклопедический словарь английского языка Merriam Webster. 2003