Exact historical dictionary sense
Rest in Webster's 1913 dictionary
The 1913 record labels rest as noun. Its source-bounded etymology and selected historical definition appear below.
[F. reste, fr. rester to remain, L. restare to stay back, remain; pref. re- re- + stare to stand, stay. See Stand, and cf. Arrest, Restive.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "rest" is labeled noun. Its etymology is recorded as: "[F. reste, fr. rester to remain, L. restare to stay back, remain; pref. re- re- + stare to stand, stay. See Stand, and cf. Arrest, Restive.]" The selected historical definition says: "That which is left, or which remains after the separation of a part, either in fact or in contemplation; remainder; residue."