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[In Fr. æthuse; Gr. αΐθω (aithō) =to light up, to kindle, to burn. The name is given from its acridne .] Le er Hemlock, ETHUSA CYNAPIUM (FOOL'S PARSLEY). or Fool's Parsley. A genus of plants belonging to the order Apiaceæ, or Umbellifers. The Æ . cynapium , or Fool's Parsley, occurs in Britain. In aspect it partly resembles garden parsley, but is darker in colour, and is not curled. Its odour is unpleasant. It is so acrid as to be poisonous. As an antidote, Dr. Christ is on recommends that milk be swallowed, that mustard-poultices be applied to the legs, and that the body be sponged with vinegar.