활자본이 · 활자본을
book printed with movable type, movable-type edition
Example
고려 시대에 이미 금속 활자본이 만들어졌습니다.
Books printed with metal movable type were already made in the Goryeo era.
Word parts
활 movable+자 letter+본 edition
Literally 'living-letter edition' — the type pieces move and can be reused.
Good to know
Pronounced [활짜본] — the ㅈ after ㄹ is tensed.