forming nouns ［构成名词］
1
- in collective numerals构成集合数词：
myriad
triad.
2
- in names of females in classical mythology, such as dryad and naiad构成古典神话的女性名, 例如dryad 和naiad.
3
- in names of poems and similar compositions［构成诗歌和类似作品的名称］：
Iliad
jeremiad.
4
- forming names of members of some taxonomic groupings构成某些分类学类别成员名称：
bromeliad.
词源
from the Greek ending -as, -ad-.