<span class="searchmatch">frostproofed</span> simple past and past participle of frostproof...
<span class="searchmatch">frostproofing</span> present participle and gerund of frostproof...
simple present frostproofs, present participle <span class="searchmatch">frostproofing</span>, simple past and past participle <span class="searchmatch">frostproofed</span>) (transitive) To make resistant to frost....