\begin{definition}[Definition:Bimedial/Second Bimedial]
Let $a, b \in \R_{>0}$ be in the forms:
:$a = k^{1/4} \rho$
:$b = \dfrac {\lambda^{1/2} \rho} {k^{1/4} }$
where:
: $\rho$ is a rational number
: $k$ is a rational number whose square root is irrational.
: $\lambda$ is a rational number whose square root is irrational.
Then $a + b$ is a '''second bimedial'''.
{{:Euclid:Proposition/X/38}}
\end{definition}