rachischisisyoudaoicibaDictYouDict[rachischisis 词源字典]
"Defective closure of one or more vertebrae, usually involving the posterior part of the arch and often accompanied by myelocele; spina bifida", Late 19th cent.; earliest use found in The Lancet. From rachi- + ancient Greek σχίσις cleavage (from σχίζειν to split + -σις).[rachischisis etymology, rachischisis origin, 英语词源]