Ru'pel·la·ry noun [ From Latin rupes a rock.] Rocky. [ Obsolete] 'This rupellary nidary.' Evelyn.Ru'pert's drop` A kind of glass drop with a long tail, made by dropping melted glass into water. It is remarkable for bursting into fragments when the surface is scratched or th... Found on http://www.encyclo.co.uk/webster/R/105