From pen + trough? <span class="searchmatch">pentrough</span> (plural <span class="searchmatch">pentroughs</span>) (archaic) A penstock. “<span class="searchmatch">pentrough</span>”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G...
<span class="searchmatch">pentroughs</span> plural of <span class="searchmatch">pentrough</span>...