From prorate + -able. <span class="searchmatch">proratable</span> (not comparable) divisible pro rata (proportionately); capable of being prorated. “<span class="searchmatch">proratable</span>”, in Webster’s Revised...
From pre- + abortal. preabortal (not comparable) Before abortion (termination of pregnancy). <span class="searchmatch">proratable</span>...