Eighth
来自Big Physics
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wiktionary
From Middle English eiȝtthe, from Old English eahtoþa, from Proto-Germanic *ahtudô.
etymonline
eighth (adj., n.)
"next in order after the seventh; an ordinal numeral; being one of eight equal parts into which a whole is regarded as divided;" late 14c., eighthe, contracted from Old English eahtoða, from Proto-Germanic *ahtudon (source also of Old High German ahtoda, Old Frisian achta, German achte, Gothic ahtuda);see eight + -th (1).
