柯林斯詞典trilobite /?tra?l??ba?t/ 1. N any extinct marine arthropod of the group Trilobita, abundant in Palaeozoic times, having a segmented exoskeleton divided into three parts 三葉蟲綱動物 返回 trilobite劍橋詞典a simple , flat sea creature that lived in the earliest period of life on earth , with a hard outer layer and a body in three parts 三葉蟲 返回 trilobite