LONGICORN Meaning of LONGICORN in English [lon.gi.corn] adj [ultim. fr. L longus long + cornu horn--more at horn] (ca. 1848) 1: of, relating to, or being long-horned beetles 2: having long antennae -- longicorn n Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012