ion
ion 1. आयन "Water has hydrogen ions."

ionise
ionise 1. आयनों~में~परिवर्तित~करना "If we ionise water we get hydrogen ions."

ionosphere
ionosphere 1. आयनमंडल "In the ionosphere radio waves are reflected."

iota
iota 1. कण "There is not even an iota of truth in his saying."