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umbilical[umbilical 词源字典]

umbilical: [16] Umbilical was borrowed from medieval Latin umbilīcālis, a derivative of Latin umbilīcus ‘navel’. This went back ultimately to the Indo-European base *onobh-, a variant of which, *nobh-, produced English navel [OE].
=> navel[umbilical etymology, umbilical origin, 英语词源]