Besides
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Safin（讨论 | 贡献）2022年4月27日 (三) 00:24的版本 （建立内容为“Category:etymology == wiktionary == [https://en.wiktionary.org/wiki/besides ref] From [https://en.wikipedia.org/wiki/Middle_English Middle English] biside, e…”的新页面）
wiktionary
From Middle English biside, equivalent to beside + -s. See -s(Etymology 3)
etymonline
besides (prep.)
attested from c. 1200, common after c. 1400, from beside (q.v.) + adverbial genitive -s. Once sharing all the senses of beside, now properly limited to the adverbial sense "in addition to, otherwise."
