<p><strong>Noun:</strong></p><ul><li>Any of several trifoliate plants, as the wood sorrel, <em>Oxalis acetosella</em>, or a small, pink-flowered clover, <em>Trifolium repens minus</em>, but especially <em>Trifolium procumbens</em>, a small, yellow-flowered clover: the national emblem of Ireland.</li></ul>