Chelonethi borrowed from New Latin, from chelo- chelo- + -nethi, plural of -nethus, noun from the stem of Greek nḗthein "to spin (thread, yarn)," extension (probably after klṓthein "to spin," aorist éklōsa) of a stem nē- (whence nên "to spin," nêma "yarn"), going back to Indo-European *(s)neh1-; Chelonethida, Chelonethidea, borrowed from New Latin, from Chelonethi + -ida, idea-ida , -idea