VERB (1)

1. make resistant to fire;


ADJECTIVE (1)

1. impervious to damage by fire;

The Collaborative International Dictionary of English v.0.48:

Fireproof \Fire"proof`\, a.
   Proof against fire; incombustible.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fireproof
    adj 1: impervious to damage by fire
    v 1: make resistant to fire

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "fireproof":
   airtight, ballproof, bombproof, bulletproof, burglarproof,
   corrosionproof, dampproof, fire-resistant, fire-resisting,
   fire-retardant, fire-retarded, fireproofed, flameproof, foolproof,
   hermetic, holeproof, impervious to, insulate, leakproof,
   noiseproof, proof, proof against, punctureproof, resistant,
   rustproof, shatterproof, shellproof, soundproof, tight, waterproof,
   watertight, weatherproof