Exact historical dictionary sense
Lost in Webster's 1913 dictionary
The 1913 record labels lost as adjective. Its source-bounded etymology and selected historical definition appear below.
[Prop. p. p. of OE. losien. See Lose, v. t.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "lost" is labeled adjective. Its etymology is recorded as: "[Prop. p. p. of OE. losien. See Lose, v. t.]" The selected historical definition says: "Parted with unwillingly or unintentionally; not to be found; missing; as, a lost book or sheep."