orthogonal
adj.
1570s, from French orthogonal, from orthogone, from Late Latin orthogonius, from Greek orthogonios "right-angled," from ortho- "straight" (see ortho-) + gonia "angle" (see -gon). Related: Orthogonally.
〔李〕a.互相垂直的，直角的 [gon=angle] ←ortho-[GK] =straight直的；correct正确的