chelicerate Syllabification: (che·lic·er·ate)Pronunciation: /kəˈlisəˌrāt, -rət/ ZoologyDefinition of chelicerate noun an arthropod of the large group Chelicerata; an arachnid, sea spider, or horseshoe crab. adjective relating to or denoting chelicerates. chelicerate in other Oxford dictionaries Definition of chelicerate in the British & World English dictionary