The Collaborative International Dictionary of English v.0.48:
Conserve \Con*serve"\, v. t. [imp. & p. p. Conserved; p. pr. &
vb. n. Conserving.] [F. conserver, L. conservare; con- +
servare to keep, guard. See Serve.]
1. To keep in a safe or sound state; to save; to preserve; to
The amity which . . . they meant to conserve and
maintain with the emperor. --Strype.
2. To prepare with sugar, etc., for the purpose of
preservation, as fruits, etc.; to make a conserve of.