In sponges: a dichotomous triaene; a three-forked spicule in which each fork divides into two.
Late 19th century; earliest use found in William Sollas (1849–1936), geologist and anthropologist. From dicho- + triaene.
英语词典包含464360条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。