|serən|diˌbīt, səˈrendə̇ˌb- noun
( -s )
Etymology: from Serendib, Serendip, former name for Ceylon (from Arabic Sarandīb ) + English -ite
: a mineral (Ca,Mg) 5 Al 5 B 2 Si 2 O 10 consisting of a silicate and borate of calcium, magnesium, and aluminum and occurring in irregular blue grains in Ceylon