Outer
来自Big Physics
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late Middle English: from out + -er2, replacing earlier utter1.
wiktionary
From Middle English outre, outer, outter, uttre, from Old English ūtre, ūtera, ūterra(“outer”), equivalent to out + -er. Compare German äußere(“outer”), Danish ydre(“outer”), Swedish yttre(“outer”), Icelandic ytri(“outer”).
out (verb) + -er(“agent suffix”)
etymonline
outer (adj.)
"that is farther out, that is exterior or external; of or pertaining to the outside; further removed," late 14c., comparative of out (on analogy of inner), replacing by 18c. forms descended from Old English uttera (comparative of Old English ut "out") which developed into utter (adj.) and was no longer felt as connected with out. Outer space "region beyond the earth's atmosphere" is attested from 1845.
