<p><strong>Noun</strong></p><ul><li>a slender U-shaped piece of wire, shell, etc., used by women to fasten up the hair or hold a headdress.</li><li>a bow-shaped bend in a river, or the land embraced by it.</li><li>a bow-shaped lake formed in a former channel of a river.</li></ul><p><strong>Adjective</strong></p><ul><li>sharply curved back, as in a U shape: a hairpin turn.</li></ul><p><strong>End of Response</strong></p>