<p><strong>Noun</strong></p><ul><li>Any of various trees or shrubs of the genus <em>Aesculus</em>, as <em>A. glabra</em> (Ohio buckeye), having palmate leaves, gray, scaly bark, and bell-shaped greenish-yellow flowers in upright clusters; the state tree of Ohio.</li><li>The brown nut of any of these trees.</li><li>(Initial capital letter) A native or inhabitant of Ohio (used as a nickname).</li><li>A butterfly, <em>Precis lavinia</em>, having dark-brown wings with purple or red eyespots.</li></ul>