Merriam-Webster Collegiate Dictionary - cypripedium

 noun  Etymology: New Latin, genus name, from Late Latin Cypris, a name for Venus + -pedium (modification of Greek pedilon sandal)  Date: 1807  1. any of a genus (Cypripedium) of Eurasian and North American terrestrial orchids having large usually showy drooping flowers with the lip inflated or pouched — compare lady's slipper  2. any of a genus (Paphiopedalum) of widely cultivated Asian orchids