conservative
‘a preservative agent; the quality of preserving something’
Lexical development traced from the Tamil root:
E. conseruatywe, conseruatyfe, conseruatiue, conseruatif, conservatyf < O.F. conservatiyf < Med.Lat. conservativus < Lat. conservatus < conservare ‘to keep, preserve, keep intact, guard’ <com- + servare ‘keep watch, maintain’ < suhv < ser- < Tamil iṟai