OctoberyoudaoicibaDictYouDict[October 词源字典]
October: [OE] The Romans calculated the beginning of their year from March, and so the eighth month was called octōber or octōbris mēnsis, literally ‘eighth month’ (terms derived from Latin octō ‘eight’). Other English words derived from Latin octō or its close Greek relative októ include octagon [17], octane [19], octave [14], octet [19], and octopus [18] (from Greek októpous, literally ‘eightfoot’).
=> octane, octave, octopus[October etymology, October origin, 英语词源]
OctoberyoudaoicibaDictYouDict
c.1050, from Latin October (mensis), from octo "eight," from PIE root *octo(u)- "eight" (see eight). Eighth month of the old Roman calendar (pre-46 B.C.E.), which began the year in March. For -ber see December. Replaced Old English winterfylleð. In Russian history, October Revolution (in which the Bolsheviks overthrew the Provisional Government) happened Nov. 7, but because Russia had not at that time adpoted the Gregorian calendar reform, this date was reckoned there (Old Style) as Oct. 25.