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2 definitions found

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

 understratum
 底層

From: Webster's Revised Unabridged Dictionary (1913)

 Un·der·stra·tum n.; pl. L. Understrata E. Understratums  The layer, or stratum, of earth on which the mold, or soil, rests; subsoil.
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