资料来源 : pyDict

superstratum复数

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Superstatum \Su`per*sta"tum\, n.; pl. {Superstrata}. [NL.: cf.
   L. supersternere, superstratum, to spread upon. See {Super-},
   and {Stratum}.]
   A stratum, or layer, above another.

资料来源 : WordNet®

superstrata
     See {superstratum}