From proto- + phloem. <span class="searchmatch">protophloem</span> (countable and uncountable, plural <span class="searchmatch">protophloems</span>) (botany) The form of phloem that is initially formed, composed of...
<span class="searchmatch">protophloems</span> plural of <span class="searchmatch">protophloem</span>...
From meta- + phloem. metaphloem (countable and uncountable, plural metaphloems) The mature form of phloem that has larger cells than the <span class="searchmatch">protophloem</span>...