Learn how to say Lithified correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word lithify:
verb (lithifies, lithifying, lithified)
[with object] chiefly Geology
transform (a sediment or other material) into stone:
these sediments are lithified to form shales, limestones, and sandstones
late 19th century: from Greek lithos ‘stone’ + -fy