hemlock
noun /ˈhemlɒk/
  /ˈhemlɑːk/
 - [uncountable, countable] a poisonous plant with a mass of small white flowers growing at the end of a stem that is covered in spotsTopics Plants and treesc2
 - [uncountable] poison made from hemlock
 
Word OriginOld English hymlice, hemlic, of unknown origin.