May apple Meaning, Definition & Usage

  1. noun edible but insipid fruit of the May apple plant
  2. noun North American herb with poisonous root stock and edible though insipid fruit
    mayapple; Podophyllum peltatum; wild mandrake.

WordNet

Definitions
  1. (Bot.), the fruit of an American plant (Podophyllum peltatum). Also, the plant itself (popularly called mandrake), which has two lobed leaves, and bears a single egg-shaped fruit at the forking. The root and leaves, used in medicine, are powerfully drastic.

Webster 1913