<human>:  When did the word ‘frankenstein’ come into use?
<bot>: The word frankenstein was first used in 1818 by Mary Shelley in her novel Frankenstein. The word frankenstein is a portmanteau of the words frank and monster. The word frank is a shortened form of the word frankincense, which is a type of resin. The word monster is a shortened form of the word monstrosity, which is a noun that means a grotesque or unnatural appearance.