outer

Từ điển Oxford Advanced Learner 8th

outer [outer outers] BrE [ˈaʊtə(r)] NAmE [ˈaʊtər] adjective only before noun
1. on the outside of sth
Syn: ↑external
•the outer layers of the skin
2. furthest from the inside or centre of sth
• I walked along the outer edge of the track.
•the outer suburbs of the city
•Outer London/Mongolia
• (figurative)to explore the outer (= most extreme) limits of human experience
Opp: ↑inner

Word Origin:
late Middle English: from ↑out + ↑-er, replacing earlier utter in its obsolete sense ‘outer’.