nema (1)youdaoicibaDictYouDict[nema 词源字典]
"A long, slender, tubular extension of the sicula in a graptolite", Early 20th cent. From German Nema from ancient Greek νῆμα thread.[nema etymology, nema origin, 英语词源]
nema (2)youdaoicibaDictYouDict
"A nematode, especially one that parasitizes plants", Early 20th cent. Shortened from nematode. Compare ancient Greek νῆμα thread.