1) Become calcified 2) Convert into lime 3) French word used in English 4) Harden 5) Indurate 6) Turn into lime 1) Harden 
• (v. t.) To make stony or calcareous by the deposit or secretion of salts of lime. • (v. i.) To become changed into a stony or calcareous condition, in which lime is a principal ingredient, as in the formation of teeth.
To deposit or lay down calcium salts, as in the formation of bone. ... (05 Mar 2000) ... 
Cal'ci·fy (kăl'sĭ*fī) transitive verb [ imperfect & past participle Calcified (- fīd); present participle & verbal noun Calcifying .] [ Latin calx , calcis , lime + -fy .] To make stony or...Cal'ci·fy intransitive verb To become changed into a stony or calcareous condition, in which lime is a principal ingredient, as in the formation of teeth. 
Type: Term Pronunciation: kal′si-fī Definitions: 1. To deposit or lay down calcium salts, as in the formation of bone.
[v] - become inflexible and unchanging 2. [v] - become impregnated with calcium salts 3. [v] - turn into lime 4. [v] - convert into lime
verb turn into lime; become calcified; `The rock calcified over the centuries`
become impregnated with calcium salts