From Sipylos + -ite, after one of the children of Niobe. <span class="searchmatch">sipylite</span> (uncountable) (mineralogy) A niobate of erbium. pyelitis...
from Proto-Indo-European *plu- (zero-grade form of *plew-) + *-elos. pyelitis (countable and uncountable, plural pyelitides) pyelonephritis <span class="searchmatch">sipylite</span>...