bimedial

Century Dictionary and Cyclopedia

1. n. In anc. math., a line compounded of two medials. If these latter make a rational rectangle, the compound is called a first bimedial; if they make a medial rectaugle, the compound is termed a second bimedial. In modern language this would be expressed by saying that a bimedial is a quantity of the form (√a + √b) √c, where a, b, and c are commensurable. It is a first or a second bimedial according as a b c is or is not a perfect square.

Wiktionary

1. adj. geometry Being the sum of two lines commensurable only in power (such as the side and diagonal of a square).

GNU Webster's 1913

1. adj. (Geom.) Applied to a line which is the sum of two lines commensurable only in power (as the side and diagonal of a square).