swan + mark. <span class="searchmatch">swanmark</span> (plural <span class="searchmatch">swanmarks</span>) (UK) A mark of ownership cut on the bill of a swan. 1718, The Game Law: None may have a <span class="searchmatch">Swanmark</span>, unless it be...
<span class="searchmatch">swanmarks</span> plural of <span class="searchmatch">swanmark</span>...