Webster's English Dictionary

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detritus

de.tri.tus \di-'tri-t-*s\ \-'tri-t-*s, -'tri--.tu:s\ n or de.tri.tus [F 
   de`tritus, fr. L detritus, pp. of deterere] pl  1: loose material that 
   results directly from rock disintegration esp. when  composed of rock 
   fragments 2: a product of disintegration or wearing away