sélaciencommon nounSyllable DecompositionsélacienEtymologyexpandfrom the Ancient Greek σέλαχος sélakhos (shark).Definition1. Subclass of chondrichthyans or cartilaginous fish, now called elasmobranchs (Elasmobranchii), which included sharks and rays.flags.désuetexpandLe requin est un sélacien.PluralsélaciensTranslationsenglish:selacianSee alsochondrite (cn.) cartilage (cn.) cartilagineux (adj.) chondrostéen (cn.)