I. ex ‧ tra ‧ ter ‧ res ‧ tri ‧ al 1 /ˌekstrətəˈrestriəl◂/ BrE AmE noun [countable]
a creature that people think may exist on another ↑ planet
II. extraterrestrial 2 BrE AmE adjective
relating to things that exist outside the Earth
I. ex ‧ tra ‧ ter ‧ res ‧ tri ‧ al 1 /ˌekstrətəˈrestriəl◂/ BrE AmE noun [countable]
a creature that people think may exist on another ↑ planet
II. extraterrestrial 2 BrE AmE adjective
relating to things that exist outside the Earth
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012