Furnished or marked with a ring or rings; esp. in Bot. Having an annulus or ring round the sporangium, as certain ferns and mosses.
Surrounded by an obliquely placed ring, as some spore-cases. Also said of the ferns.
英语词典包含1132095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。