lady's slipper: any of several chiefly American wildflowers having an inflated pouchlike lip; difficult or impossible to cultivate in the garden
orchid: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors
prostaglandin: a potent substance that acts like a hormone and is found in many bodily tissues (and especially in semen); produced in response to trauma and may affect blood pressure and metabolism and smooth muscle activity