Wiktionary
semistable
a. (context mathematics English) Describing a form of elliptic curve having congruent roots
Usage examples of "semistable".
He got four largish ones down, letting them land on top of each other to form a semistable barrier.
They had, it seems, developed a semistable brain whose separate and occasionally stubborn volition echoed the will of the Old Ones without always obeying it.