From prevent + -ory. <span class="searchmatch">preventory</span> (comparative more <span class="searchmatch">preventory</span>, superlative most <span class="searchmatch">preventory</span>) (rare) Preventive....
perspiratory placitory plauditory pollinivory predictory preëmptory prefatory <span class="searchmatch">preventory</span> procrastinatory profligatory prognosticatory prohibitory projectory promulgatory...