O / orthŏgōnĭus
adjective greek

orthŏgōnĭus

fem. orthŏgōnia · neut. orthŏgōnium
= ὀρθογώνιος
right-angled; rectangular; orthogonal
right-angled, rectangular, orthogonal: trigonum, Vitr. 10, 11: ossicla, Aus. praef. ad Idyll. 13.