VERB (1)

1. make resistant to bad weather;


ADJECTIVE (1)

1. able to withstand exposure to weather without damage;
- Example: "weatherproof electric wiring"
- Example: "a weatherproof coat"

The Collaborative International Dictionary of English v.0.48:

Weatherproof \Weath"er*proof`\, a.
   Proof against rough weather.
   [1913 Webster]

WordNet (r) 3.0 (2006):

weatherproof
    adj 1: able to withstand exposure to weather without damage;
           "weatherproof electric wiring"; "a weatherproof coat"
    v 1: make resistant to bad weather

Moby Thesaurus II by Grady Ward, 1.0:

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