Definition of mortalize in English:
mortalize
(also mortalise)
verb ˈmɔːtəlʌɪzˈmɔːt(ə)lʌɪz
1no object To become mortal. Now rare.
2with object To make mortal.
Origin
Early 17th century; earliest use found in Joshua Sylvester (d. 1618), poet and translator. From mortal + -ize.