Inure is the preferred spelling of this word meaning "to accustom," "to habituate," "to make used to something by exercise": "His poverty-stricken early life inured him to the hardships of old age." "The food was poorly prepared, but after several weeks I became inured to it." "His muscles soon became inured to the heavy lifting involved." See also immured.
Dictionary of problem words and expressions. Harry Shaw. 1975.