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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 substrata
 substratum的複數形

From: Webster's Revised Unabridged Dictionary (1913)

 Sub·stra·tum n.; pl. Substrata
 1. That which is laid or spread under; that which underlies something, as a layer of earth lying under another; specifically Agric., the subsoil.
 2. Metaph. The permanent subject of qualities or cause of phenomena; substance.