The Collaborative International Dictionary
Bimedial
Bimedial \Bi*me"di*al\, a. [Pref. bi- + medial.] (Geom.) Applied to a line which is the sum of two lines commensurable only in power (as the side and diagonal of a square).
Wiktionary
bimedial
a. (context geometry of a line English) Being the sum of two lines commensurable only in power (such as the side and diagonal of a square).