What does "rupellary" mean?

Rupellary: Rocky. [Obs.] "This rupellary nidary." Evelyn. RUPERT'S DROP 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 the tail broken; -- so called from Prince Rupert, nephew of Charles I., by whom they were first brought to England. Called also Rupert's ball, and glass tear.