myEtymology.com: English etymology of diagonal

Etymology of the English word diagonal

the English word diagonal

derived from the Vulgar Latin word diagonalis (diagonal, from one angle to an opposite)

derived from the Latin word diagonus (diagonal line, line from one angle to an opposite)

derived from the Greek word diagonios

using the Medieval Greek prefix dia-, δια-

derived from the Greek word dia, διά (through, between)

derived from the Greek word gonia, γωνία (angle; an angle)

derived from the Proto-Indo-European root *genu-

The earliest known usage of diagonal in English dates from the 16th century.

Dutch diagonaal, French diagonal, German diagonal, Norwegian diagonal, Swedish diagonal

Word found in Modern English