- any orchid of the genus Cypripedium, the flowers of which have a protruding petal somewhat resembling a slipper: all species are reduced in numbers, some greatly.
- any of several other related plants having similar flowers, as of the genera Paphiopedilum and Phragmipedium.
Origin of lady's-slipper
An Americanism dating back to 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018