preserveyoudaoicibaDictYouDict
preserve: [14] The -serve of preserve comes from Latin servāre ‘keep safe’ (no relation to servīre ‘serve’, but source also of English conserve, observe, and reserve). Combination with prae- ‘before’ produced medieval Latin praeservāre ‘guard beforehand, take steps to ward off possible harm’, which reached English via Old French preserver.
=> conserve, observe, reserve
preserve (v.)youdaoicibaDictYouDict
late 14c., "keep safe," from Anglo-French preservare, Old French preserver, from Medieval Latin preservare "keep, preserve," from Late Latin praeservare "guard beforehand," from Latin prae "before" (see pre-) + servare "to keep safe" (see observe). As a treatment of fruit, etc., 1570s; of organic bodies from 1610s. Related: Preserved; preserving.
preserve (n.)youdaoicibaDictYouDict
"fruit preserved with sugar," c. 1600, from preserve (v.). Earlier it meant "a preservative" (1550s). Sense of "protected place for animals or plants" (a sense more properly belonging to conserve) is from 1807.