Webster's Revised Unabridged Dictionary · 1913

Conserve

Conserve , transitive verb

[French conserver, Latin conservare; con- + servare to keep, guard. See Serve.]

1.
To keep in a safe or sound state; to save; to preserve; to protect.
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.

Conserve , noun

[French conserve, from conserver.]

1.
Anything which is conserved; especially, a sweetmeat prepared with sugar; a confection.
I shall... study broths, plasters, and conserves, till from a fine lady I become a notable woman. — Tatler
2.
(Medicine) A medicinal confection made of freshly gathered vegetable substances mixed with finely powdered refined sugar. See Confection.
3.
A conservatory. [Obsolete] — Evelyn