lady's-slipper

or la·dy-slip·per

[ ley-deez-slip-er ]
/ ˈleɪ dizˌslɪp ər /

noun

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

British Dictionary definitions for lady's-slipper

lady's-slipper

noun

any of various orchids of the Eurasian genus Cypripedium, esp C. calceolus, having reddish or purple flowers See also moccasin flower, cypripedium