From ray + -proof. <span class="searchmatch">rayproof</span> (comparative more <span class="searchmatch">rayproof</span>, superlative most <span class="searchmatch">rayproof</span>) Shielded to prevent the emission of X-rays....
radiationproof radonproof raidproof rainproof ratproof rattleproof ravelproof <span class="searchmatch">rayproof</span> recessionproof review-proof rifleproof riotproof riskproof robberproof...