\begin{definition}[Definition:Feigenbaum Constants/Second]
The '''secondFeigenbaum constant''' $\alpha$ is the ratio between the width of a tine and the width of one of its two subtines (except the tine closest to the fold).
A negative sign is applied to $\alpha$ when the ratio between the lower subtine and the width of the tine is measured.
Its approximate value is given by:
:$\alpha \approx 2 \cdotp 50290 \, 78750 \, 95892 \, 82228 \, 39028 \, 73218 \, 21578 \cdots$
{{OEIS|A006891}}
\end{definition}