To Fossilize
This page is the CodyCross answer for the clue below from World of Books, Group 284, Puzzle 5 (Autobiographies).
Question is: To Fossilize
and the answer is: OSSIFY
Word Meaning:
OSSIFY — (ambitransitive) To transform (or cause to transform) from a softer animal substance into bone; particularly the processes of growth in humans and animals.
Definitions from Wiktionary.