τετράρρυμος
From LSJ
περὶ ἀλόγων γραμμῶν καὶ ναστῶν → on incommensurable lines and solids
English (LSJ)
ον,
A with four poles, i.e. eight-horsed, ἅρμα X.Cyr.6.1.51, 6.4.2, Philostr.V A2.42. II τετράρυμον ἄμφοδον = complitus (sic), Gloss. (from ῥύμη street).