<p><strong>Noun</strong></p><ul><li>(especially collectively) Killi fish, (especially referring to two or more kinds or species) Killi fishes.</li><li>Any of several small, oviparous cyprinodont fishes, especially of the genus <em>Fundulus</em>, found in salt, brackish, and fresh waters.</li><li>Any of several livebearers.</li></ul>