| 释义 |
pte·rid·i·um
\təˈridēəm, teˈr-\ noun
Usage: capitalized
Etymology: New Latin, from Pterid-, Pteris + -ium
: a genus of ferns that are related to and sometimes included in Pteris and that have in addition to the false indusium formed by the frond margin a true indusium on the inner side of the sori — see bracken |