acritarch

/ak-ri-tahrk/US // ˈæk rɪˌtɑrk //

尖锐湿疣,尖锐化,尖锐性,尖锐湿疣的危害

Definitions

n.名词 noun

1
Paleontology.
- : any of various microfossils, of unknown biological affinities, having a central cavity enclosed by a wall of chiefly organic composition.