Definition of rock lily in US English:

rock lily

noun

  • 1Any of various flowering plants which grow among or on rocks; especially (Australian) the Australian orchid, Dendrobium speciosum, and (North American) the pasque flower, Pulsatilla patens.

  • 2A clubmoss of tropical America, Selaginella convoluta (Obsolete rare).

Origin

Early 19th century; earliest use found in La Belle Assemblée.