A Sterol

<p><span class="oneClick-link">any</span> <span class="oneClick-link">of</span> <span class="oneClick-link">a</span> <span class="oneClick-link">group</span> <span class="oneClick-link">of</span> <span class="oneClick-link">solid,</span> <span class="oneClick-link">mostly</span> <span class="oneClick-link oneClick-available">unsaturated,</span> <span class="oneClick-link">polycyclic</span> <span class="oneClick-link">alcohols,</span> <span class="oneClick-link">as</span><span class="oneClick-link oneClick-available">cholesterol</span> <span class="oneClick-link">and</span> <a class="dbox-xref dbox-roman" href="http://www.dictionary.com/browse/ergosterol">ergosterol</a>, <span class="oneClick-link">derived</span> <span class="oneClick-link">from</span> <span class="oneClick-link oneClick-available">plants</span> <span class="oneClick-link">or</span> <span class="oneClick-link oneClick-available">animals.</span></p>