Etymology of the English word diedre
the English word
diedrederived from the English word
dihedralderived from the English word
di-derived from the New Latin word
di-derived from the Greek word
di-, δι-, δί-
derived from the Greek word
dis, δίς (double; twice)
derived from the Greek word
hedra, ἕδρα
derived from the Proto-Indo-European root
*sed-Date
The earliest known usage of diedre in English dates from the 20th century.