<p><strong>Noun</strong></p><ul><li>Plural: pilei</li><li>A steep gorge or gully on the side of a mountain, especially in the Alps.</li><li>The umbrella or bell of a jellyfish.</li><li>A small, thin cloud just above or attached to a growing cumulus cloud.</li><li>A felt skullcap worn by the ancient Romans and Greeks.</li></ul>